CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013...

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CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Transcript of CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013...

Page 1: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

CHAPTER 2

ORGANIZING AND GRAPHING DATA

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Opening Example

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

RAW DATA Definition Data recorded in the sequence in which they are collected

and before they are processed or ranked are called raw data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 21 Ages of 50 Students

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Table 22 Status of 50 Students

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ORGANIZING AND GRAPHING DATA

Frequency Distributions Relative Frequency and Percentage Distributions Graphical Presentation of Qualitative Data

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Table 23 Types of Employment Students Intend to Engage In

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Frequency Distributions Definition A frequency distribution of a qualitative variable lists all

categories and the number of elements that belong to each of the categories

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

A sample of 30 persons who often consume donuts were asked what variety of donuts was their favorite The responses from these 30 persons were as follows

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

glazed filled other plain glazed other

frosted filled filled glazed other frosted

glazed plain other glazed glazed filled

frosted plain other other frosted filled

filled other frosted glazed glazed filled

Construct a frequency distribution table for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1 SolutionTable 24 Frequency Distribution of Favorite Donut Variety

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Relative Frequency and Percentage Distributions

Calculating Relative Frequency of a Category

sfrequencie all of Sum

category that ofFrequency category a offrequency lativeRe

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Relative Frequency and Percentage Distributions

Calculating Percentage Percentage = (Relative frequency) 100

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Example 2-2 Determine the relative frequency and percentage for the

data in Table 24

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Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

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Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

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Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

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Figure 21 Bar graph for the frequency distribution of Table 24

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Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

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Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

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Table 26 Calculating Angle Sizes for the Pie Chart

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Figure 22 Pie chart for the percentage distribution of Table 25

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ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

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Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

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Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

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Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

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Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

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Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

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Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

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Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

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Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

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Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

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Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

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Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

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STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

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Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

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Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

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Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

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Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

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Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

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Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

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TI-84

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Minitab

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Minitab

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Minitab

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Minitab

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Minitab

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Excel

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Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 2: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Opening Example

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

RAW DATA Definition Data recorded in the sequence in which they are collected

and before they are processed or ranked are called raw data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 21 Ages of 50 Students

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 22 Status of 50 Students

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING DATA

Frequency Distributions Relative Frequency and Percentage Distributions Graphical Presentation of Qualitative Data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 23 Types of Employment Students Intend to Engage In

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution of a qualitative variable lists all

categories and the number of elements that belong to each of the categories

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

A sample of 30 persons who often consume donuts were asked what variety of donuts was their favorite The responses from these 30 persons were as follows

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

glazed filled other plain glazed other

frosted filled filled glazed other frosted

glazed plain other glazed glazed filled

frosted plain other other frosted filled

filled other frosted glazed glazed filled

Construct a frequency distribution table for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1 SolutionTable 24 Frequency Distribution of Favorite Donut Variety

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency of a Category

sfrequencie all of Sum

category that ofFrequency category a offrequency lativeRe

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Percentage Percentage = (Relative frequency) 100

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-2 Determine the relative frequency and percentage for the

data in Table 24

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Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

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Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 21 Bar graph for the frequency distribution of Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 26 Calculating Angle Sizes for the Pie Chart

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Figure 22 Pie chart for the percentage distribution of Table 25

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

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Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

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Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

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STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

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Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

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Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

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Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

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Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

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Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

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Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

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Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

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TI-84

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TI-84

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Minitab

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Minitab

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Minitab

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Minitab

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Minitab

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Excel

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Excel

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  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 3: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

RAW DATA Definition Data recorded in the sequence in which they are collected

and before they are processed or ranked are called raw data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 21 Ages of 50 Students

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Table 22 Status of 50 Students

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ORGANIZING AND GRAPHING DATA

Frequency Distributions Relative Frequency and Percentage Distributions Graphical Presentation of Qualitative Data

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Table 23 Types of Employment Students Intend to Engage In

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Frequency Distributions Definition A frequency distribution of a qualitative variable lists all

categories and the number of elements that belong to each of the categories

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

A sample of 30 persons who often consume donuts were asked what variety of donuts was their favorite The responses from these 30 persons were as follows

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

glazed filled other plain glazed other

frosted filled filled glazed other frosted

glazed plain other glazed glazed filled

frosted plain other other frosted filled

filled other frosted glazed glazed filled

Construct a frequency distribution table for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1 SolutionTable 24 Frequency Distribution of Favorite Donut Variety

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Relative Frequency and Percentage Distributions

Calculating Relative Frequency of a Category

sfrequencie all of Sum

category that ofFrequency category a offrequency lativeRe

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Relative Frequency and Percentage Distributions

Calculating Percentage Percentage = (Relative frequency) 100

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Example 2-2 Determine the relative frequency and percentage for the

data in Table 24

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Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

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Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

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Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

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Figure 21 Bar graph for the frequency distribution of Table 24

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Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

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Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

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Table 26 Calculating Angle Sizes for the Pie Chart

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Figure 22 Pie chart for the percentage distribution of Table 25

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ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

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Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

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Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

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Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

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Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

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Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

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Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

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Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

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Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

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Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 4: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Table 21 Ages of 50 Students

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 22 Status of 50 Students

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING DATA

Frequency Distributions Relative Frequency and Percentage Distributions Graphical Presentation of Qualitative Data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 23 Types of Employment Students Intend to Engage In

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution of a qualitative variable lists all

categories and the number of elements that belong to each of the categories

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

A sample of 30 persons who often consume donuts were asked what variety of donuts was their favorite The responses from these 30 persons were as follows

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

glazed filled other plain glazed other

frosted filled filled glazed other frosted

glazed plain other glazed glazed filled

frosted plain other other frosted filled

filled other frosted glazed glazed filled

Construct a frequency distribution table for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1 SolutionTable 24 Frequency Distribution of Favorite Donut Variety

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency of a Category

sfrequencie all of Sum

category that ofFrequency category a offrequency lativeRe

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Percentage Percentage = (Relative frequency) 100

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-2 Determine the relative frequency and percentage for the

data in Table 24

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Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

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Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 21 Bar graph for the frequency distribution of Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 26 Calculating Angle Sizes for the Pie Chart

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Figure 22 Pie chart for the percentage distribution of Table 25

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

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Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

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Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 5: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Table 22 Status of 50 Students

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING DATA

Frequency Distributions Relative Frequency and Percentage Distributions Graphical Presentation of Qualitative Data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 23 Types of Employment Students Intend to Engage In

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution of a qualitative variable lists all

categories and the number of elements that belong to each of the categories

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

A sample of 30 persons who often consume donuts were asked what variety of donuts was their favorite The responses from these 30 persons were as follows

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

glazed filled other plain glazed other

frosted filled filled glazed other frosted

glazed plain other glazed glazed filled

frosted plain other other frosted filled

filled other frosted glazed glazed filled

Construct a frequency distribution table for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1 SolutionTable 24 Frequency Distribution of Favorite Donut Variety

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Relative Frequency and Percentage Distributions

Calculating Relative Frequency of a Category

sfrequencie all of Sum

category that ofFrequency category a offrequency lativeRe

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Relative Frequency and Percentage Distributions

Calculating Percentage Percentage = (Relative frequency) 100

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Example 2-2 Determine the relative frequency and percentage for the

data in Table 24

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Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

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Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

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Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

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Figure 21 Bar graph for the frequency distribution of Table 24

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Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

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Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

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Table 26 Calculating Angle Sizes for the Pie Chart

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Figure 22 Pie chart for the percentage distribution of Table 25

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ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

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Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

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Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

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Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

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Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

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Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

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Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

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Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

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Minitab

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Minitab

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Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 6: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

ORGANIZING AND GRAPHING DATA

Frequency Distributions Relative Frequency and Percentage Distributions Graphical Presentation of Qualitative Data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 23 Types of Employment Students Intend to Engage In

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution of a qualitative variable lists all

categories and the number of elements that belong to each of the categories

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

A sample of 30 persons who often consume donuts were asked what variety of donuts was their favorite The responses from these 30 persons were as follows

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

glazed filled other plain glazed other

frosted filled filled glazed other frosted

glazed plain other glazed glazed filled

frosted plain other other frosted filled

filled other frosted glazed glazed filled

Construct a frequency distribution table for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1 SolutionTable 24 Frequency Distribution of Favorite Donut Variety

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency of a Category

sfrequencie all of Sum

category that ofFrequency category a offrequency lativeRe

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Percentage Percentage = (Relative frequency) 100

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-2 Determine the relative frequency and percentage for the

data in Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 21 Bar graph for the frequency distribution of Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 26 Calculating Angle Sizes for the Pie Chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 22 Pie chart for the percentage distribution of Table 25

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

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Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

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Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

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TI-84

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TI-84

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Minitab

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Minitab

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Minitab

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Minitab

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Minitab

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Excel

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Excel

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  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 7: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Table 23 Types of Employment Students Intend to Engage In

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution of a qualitative variable lists all

categories and the number of elements that belong to each of the categories

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

A sample of 30 persons who often consume donuts were asked what variety of donuts was their favorite The responses from these 30 persons were as follows

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

glazed filled other plain glazed other

frosted filled filled glazed other frosted

glazed plain other glazed glazed filled

frosted plain other other frosted filled

filled other frosted glazed glazed filled

Construct a frequency distribution table for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1 SolutionTable 24 Frequency Distribution of Favorite Donut Variety

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Relative Frequency and Percentage Distributions

Calculating Relative Frequency of a Category

sfrequencie all of Sum

category that ofFrequency category a offrequency lativeRe

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Relative Frequency and Percentage Distributions

Calculating Percentage Percentage = (Relative frequency) 100

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Example 2-2 Determine the relative frequency and percentage for the

data in Table 24

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Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

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Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

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Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

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Figure 21 Bar graph for the frequency distribution of Table 24

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Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

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Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

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Table 26 Calculating Angle Sizes for the Pie Chart

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Figure 22 Pie chart for the percentage distribution of Table 25

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ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

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Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

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Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

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Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

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Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

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Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

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Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

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Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

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TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

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Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 8: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Frequency Distributions Definition A frequency distribution of a qualitative variable lists all

categories and the number of elements that belong to each of the categories

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

A sample of 30 persons who often consume donuts were asked what variety of donuts was their favorite The responses from these 30 persons were as follows

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

glazed filled other plain glazed other

frosted filled filled glazed other frosted

glazed plain other glazed glazed filled

frosted plain other other frosted filled

filled other frosted glazed glazed filled

Construct a frequency distribution table for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1 SolutionTable 24 Frequency Distribution of Favorite Donut Variety

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency of a Category

sfrequencie all of Sum

category that ofFrequency category a offrequency lativeRe

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Percentage Percentage = (Relative frequency) 100

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-2 Determine the relative frequency and percentage for the

data in Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

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Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 21 Bar graph for the frequency distribution of Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 26 Calculating Angle Sizes for the Pie Chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 22 Pie chart for the percentage distribution of Table 25

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 9: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-1

A sample of 30 persons who often consume donuts were asked what variety of donuts was their favorite The responses from these 30 persons were as follows

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1

glazed filled other plain glazed other

frosted filled filled glazed other frosted

glazed plain other glazed glazed filled

frosted plain other other frosted filled

filled other frosted glazed glazed filled

Construct a frequency distribution table for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1 SolutionTable 24 Frequency Distribution of Favorite Donut Variety

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Relative Frequency and Percentage Distributions

Calculating Relative Frequency of a Category

sfrequencie all of Sum

category that ofFrequency category a offrequency lativeRe

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Relative Frequency and Percentage Distributions

Calculating Percentage Percentage = (Relative frequency) 100

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Example 2-2 Determine the relative frequency and percentage for the

data in Table 24

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Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

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Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

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Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

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Figure 21 Bar graph for the frequency distribution of Table 24

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Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

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Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

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Table 26 Calculating Angle Sizes for the Pie Chart

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Figure 22 Pie chart for the percentage distribution of Table 25

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ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

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Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

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Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

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Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

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Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

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Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

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Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

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Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

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TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

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Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

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Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 10: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-1

glazed filled other plain glazed other

frosted filled filled glazed other frosted

glazed plain other glazed glazed filled

frosted plain other other frosted filled

filled other frosted glazed glazed filled

Construct a frequency distribution table for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-1 SolutionTable 24 Frequency Distribution of Favorite Donut Variety

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency of a Category

sfrequencie all of Sum

category that ofFrequency category a offrequency lativeRe

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Percentage Percentage = (Relative frequency) 100

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-2 Determine the relative frequency and percentage for the

data in Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 21 Bar graph for the frequency distribution of Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 26 Calculating Angle Sizes for the Pie Chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 22 Pie chart for the percentage distribution of Table 25

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

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STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

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Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

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Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

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Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

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Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

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Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

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TI-84

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Minitab

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Minitab

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Minitab

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Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

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Excel

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Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 11: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-1 SolutionTable 24 Frequency Distribution of Favorite Donut Variety

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Relative Frequency and Percentage Distributions

Calculating Relative Frequency of a Category

sfrequencie all of Sum

category that ofFrequency category a offrequency lativeRe

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Relative Frequency and Percentage Distributions

Calculating Percentage Percentage = (Relative frequency) 100

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Example 2-2 Determine the relative frequency and percentage for the

data in Table 24

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Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

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Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

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Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

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Figure 21 Bar graph for the frequency distribution of Table 24

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Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

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Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

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Table 26 Calculating Angle Sizes for the Pie Chart

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Figure 22 Pie chart for the percentage distribution of Table 25

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ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

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Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

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Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

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Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

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Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

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Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

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Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 12: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Relative Frequency and Percentage Distributions

Calculating Relative Frequency of a Category

sfrequencie all of Sum

category that ofFrequency category a offrequency lativeRe

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Percentage Percentage = (Relative frequency) 100

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-2 Determine the relative frequency and percentage for the

data in Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 21 Bar graph for the frequency distribution of Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 26 Calculating Angle Sizes for the Pie Chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 22 Pie chart for the percentage distribution of Table 25

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

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Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

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Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 13: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Relative Frequency and Percentage Distributions

Calculating Percentage Percentage = (Relative frequency) 100

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-2 Determine the relative frequency and percentage for the

data in Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 21 Bar graph for the frequency distribution of Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 26 Calculating Angle Sizes for the Pie Chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 22 Pie chart for the percentage distribution of Table 25

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

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Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

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Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

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Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

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Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

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STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

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Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

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Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

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Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

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Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

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Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

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Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

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TI-84

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TI-84

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Minitab

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Minitab

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Minitab

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Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

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Excel

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Excel

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  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 14: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-2 Determine the relative frequency and percentage for the

data in Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

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Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

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Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

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Figure 21 Bar graph for the frequency distribution of Table 24

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Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

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Table 26 Calculating Angle Sizes for the Pie Chart

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Figure 22 Pie chart for the percentage distribution of Table 25

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ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

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Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

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Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

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Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

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Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

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Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

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Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

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Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

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Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

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Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

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TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

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Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 15: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-2 SolutionTable 25 Relative Frequency and Percentage Distributions of Favorite Donut Variety

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 21 Bar graph for the frequency distribution of Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 26 Calculating Angle Sizes for the Pie Chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 22 Pie chart for the percentage distribution of Table 25

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ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

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Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

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Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 16: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their Parents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 21 Bar graph for the frequency distribution of Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 26 Calculating Angle Sizes for the Pie Chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 22 Pie chart for the percentage distribution of Table 25

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

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Table 29 Frequency Distribution for the Data on iPods Sold

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Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

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Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

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Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

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Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

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Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

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Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

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Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

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STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

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Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

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Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

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Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

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Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

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Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

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Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

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Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

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Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

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TI-84

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TI-84

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Minitab

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Minitab

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Minitab

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Minitab

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Minitab

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Excel

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Excel

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  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 17: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Graphical Presentation of Qualitative Data

Definition A graph made of bars whose heights represent the

frequencies of respective categories is called a bar graph

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Figure 21 Bar graph for the frequency distribution of Table 24

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Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

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Table 26 Calculating Angle Sizes for the Pie Chart

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Figure 22 Pie chart for the percentage distribution of Table 25

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ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

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Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

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Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

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Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

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Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

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Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

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Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

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Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

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Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

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Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

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Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

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TI-84

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Minitab

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Minitab

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Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 18: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 21 Bar graph for the frequency distribution of Table 24

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 26 Calculating Angle Sizes for the Pie Chart

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Figure 22 Pie chart for the percentage distribution of Table 25

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

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Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 19: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Case Study 2-2 Employeesrsquo Overall Financial Stress Levels

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 26 Calculating Angle Sizes for the Pie Chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 22 Pie chart for the percentage distribution of Table 25

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

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Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

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Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

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Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

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Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

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Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

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Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

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Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

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Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

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Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

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Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

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TI-84

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TI-84

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Minitab

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Minitab

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Minitab

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Minitab

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Minitab

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Excel

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Excel

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  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 20: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Graphical Presentation of Qualitative Data Definition A circle divided into portions that represent the relative

frequencies or percentages of a population or a sample belonging to different categories is called a pie chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 26 Calculating Angle Sizes for the Pie Chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 22 Pie chart for the percentage distribution of Table 25

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ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

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Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

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Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

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Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

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Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

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Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

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Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

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Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

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TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

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Minitab

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Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 21: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Table 26 Calculating Angle Sizes for the Pie Chart

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 22 Pie chart for the percentage distribution of Table 25

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 22: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 22 Pie chart for the percentage distribution of Table 25

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

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Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

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Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

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Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

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Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

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Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

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STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

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Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

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Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

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Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

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Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

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Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

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Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

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Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

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Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

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TI-84

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TI-84

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Minitab

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Minitab

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Minitab

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Minitab

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Minitab

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Excel

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Excel

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  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 23: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

ORGANIZING AND GRAPHING QUANTITATIVE Frequency Distributions Constructing Frequency Distribution Tables Relative and Percentage Distributions Graphing Grouped Data

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Table 27 Weekly Earnings of 100 Employees of a Company

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Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

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Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

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Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

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Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

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Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

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Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

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Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

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Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

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Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

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STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 24: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Table 27 Weekly Earnings of 100 Employees of a Company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 25: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Frequency Distributions Definition A frequency distribution for quantitative data lists all

the classes and the number of values that belong to each class Data presented in the form of a frequency distribution are called grouped data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 25 Frequency polygon for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

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Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

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STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

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TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 26: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Frequency Distributions Definition The class boundary is given by the midpoint of the upper

limit of one class and the lower limit of the next class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 27: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Frequency Distributions

Finding Class Width

Class width = Upper boundary ndash Lower boundary

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

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Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

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Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

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Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

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Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

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Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

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Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

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STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

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Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

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Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

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Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

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Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

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Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

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Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

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TI-84

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Minitab

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Minitab

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Minitab

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Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

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Excel

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  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 28: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Frequency Distributions

Calculating Class Midpoint or Mark

2

limit Upper limit Lower markor midpoint Class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

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Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

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Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

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Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

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Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

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TI-84

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Minitab

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Minitab

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Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 29: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Constructing Frequency Distribution Tables

Calculation of Class Width

classes ofNumber

alueSmallest v - lueLargest va widthclass eApproximat

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

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Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 30: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Table 28 Class Boundaries Class Widths and Class Midpoints for Table 27

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

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Figure 23 Frequency histogram for Table 29

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Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

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Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

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Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

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Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

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Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

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Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

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Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

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Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

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Figure 212 Ogive for the cumulative frequency distribution of Table 214

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STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

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Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

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Figure 213 Stem-and-leaf display

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Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

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Figure 214 Stem-and-leaf display of test scores

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Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

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Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

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Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

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Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

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Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

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Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

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Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

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Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

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Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

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Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

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Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

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Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

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TI-84

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Minitab

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Minitab

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Minitab

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Minitab

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Minitab

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Excel

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Excel

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  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 31: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-3

The following data give the total number of iPodsreg sold by a mail order company on each of 30 days Construct a frequency distribution table

8 25 11 15 29 22 10 5 17 21

22 13 26 16 18 12 9 26 20 16

23 14 19 23 20 16 27 16 21 14

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

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Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

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Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

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Figure 26 Frequency distribution curve

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Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

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Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

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Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

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Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

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SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

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Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

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Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 32: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-3 Solution

29 5Approximate width of each class 48

5

Now we round this approximate width to a convenient number say 5 The lower limit of the first class can be taken as 5 or any number less than 5 Suppose we take 5 as the lower limit of the first class Then our classes will be 5 ndash 9 10 ndash 14 15 ndash 19 20 ndash 24 and 25 ndash 29

The minimum value is 5 and the maximum value is 29 Suppose we decide to group these data using five classes of equal width Then

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

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Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

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Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 33: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Table 29 Frequency Distribution for the Data on iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 25 Frequency polygon for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 34: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Relative Frequency and Percentage Distributions

Calculating Relative Frequency and Percentage

100 frequency) (Relative Percentage

sfrequencie all of Sum

class that of Frequencyclass a of frequency Relative

f

f

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 35: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-4 Calculate the relative frequencies and percentages for

Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 25 Frequency polygon for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

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CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 36: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-4 SolutionTable 210 Relative Frequency and Percentage Distributions for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 25 Frequency polygon for Table 29

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Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 37: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Graphing Grouped Data Definition A histogram is a graph in which classes are marked on the

horizontal axis and the frequencies relative frequencies or percentages are marked on the vertical axis The frequencies relative frequencies or percentages are represented by the heights of the bars In a histogram the bars are drawn adjacent to each other

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 25 Frequency polygon for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 38: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 23 Frequency histogram for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 24 Relative frequency histogram for Table 210

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 25 Frequency polygon for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 39: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 24 Relative frequency histogram for Table 210

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 25 Frequency polygon for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 40: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Case Study 2-3 How Long Does Your Typical One-Way Commute Take

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 25 Frequency polygon for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 41: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Graphing Grouped Data Definition A graph formed by joining the midpoints of the tops of

successive bars in a histogram with straight lines is called a polygon

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 25 Frequency polygon for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

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Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

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Figure 210 A histogram with uniform distribution

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Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

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DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

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TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

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Excel

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  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 42: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 25 Frequency polygon for Table 29

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 43: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Case Study 2-4 How Much Does it Cost to Insure a Car

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 44: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 26 Frequency distribution curve

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 45: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-5 The percentage of the population working in the United

States peaked in 2000 but dropped to the lowest level in 30 years in 2010 Table 211 shows the percentage of the population working in each of the 50 states in 2010 These percentages exclude military personnel and self-employed persons (Source USA TODAY April 14 2011 Based on data from the US Census Bureau and US Bureau of Labor Statistics)

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 46: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-5

Construct a frequency distribution table Calculate the relative frequencies and percentages for all classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 47: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-5 Solution

The minimum value in the data set of Table 211 is 367 and the maximum value is 558 Suppose we decide to group these data using six classes of equal width Then

We round this to a more convenient number say 3 We can take a lower limit of the first class equal to 367 or any number lower than 367 If we start the first class at 36 the classes will be written as 36 to less than 39 39 to less than 42 and so on

119808119849119849119851119848119857119842119846119834119853119838119856119842119837119853119841119848119839 119834119836119845119834119852119852=558minus367

6=318

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 48: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Table 212 Frequency Relative Frequency and Percentage Distributions of the Percentage of Population Workings

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 49: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-6 The administration in a large city wanted to know the

distribution of vehicles owned by households in that city A sample of 40 randomly selected households from this city produced the following data on the number of vehicles owned

5 1 1 2 0 1 1 2 1 11 3 3 0 2 5 1 2 3 42 1 2 2 1 2 2 1 1 14 2 1 1 2 1 1 4 1 3

Construct a frequency distribution table for these data using

single-valued classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 50: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-6 SolutionTable 213 Frequency Distribution of Vehicles Owned

The observations assume only six distinct values 0 1 2 3 4 and 5 Each of these six values is used as a class in the frequency distribution in Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 51: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 27 Bar graph for Table 213

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 52: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Case Study 2-5 How Many Cups of Coffee Do You Drink a Day

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 53: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

SHAPES OF HISTOGRAMS

1 Symmetric2 Skewed3 Uniform or Rectangular

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 54: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 28 Symmetric histograms

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 55: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 29 (a) A histogram skewed to the right (b) A histogram skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 56: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 210 A histogram with uniform distribution

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 57: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 211 (a) and (b) Symmetric frequency curves (c) Frequency curve skewed to the right (d) Frequency curve skewed to the left

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 58: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition A cumulative frequency distribution gives the total number

of values that fall below the upper boundary of each class

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 59: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-7 Using the frequency distribution of Table 29 reproduced here

prepare a cumulative frequency distribution for the number of iPods sold by that company

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 60: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-7 SolutionTable 214 Cumulative Frequency Distribution of iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 61: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

CUMULATIVE FREQUENCY DISTRIBUTIONS

Calculating Cumulative Relative Frequency and Cumulative Percentage

100 frequency) relative e(Cumulativ percentage Cumulative

set data in the nsobservatio Total

class a offrequency Cumulativefrequency relative Cumulative

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 62: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Table 215 Cumulative Relative Frequency and Cumulative Percentage Distributions for iPods Sold

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 63: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

CUMULATIVE FREQUENCY DISTRIBUTIONS

Definition An ogive is a curve drawn for the cumulative frequency

distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 64: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 212 Ogive for the cumulative frequency distribution of Table 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 65: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

STEM-AND-LEAF DISPLAYS Definition In a stem-and-leaf display of quantitative data each value

is divided into two portions ndash a stem and a leaf The leaves for each stem are shown separately in a display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 66: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-8 The following are the scores of 30 college students on a

statistics test

Construct a stem-and-leaf display

756983

527284

808177

966164

657671

798687

717972

876892

935057

959298

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 67: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-8 Solution To construct a stem-and-leaf display for these scores we split

each score into two parts The first part contains the first digit which is called the stem The second part contains the second digit which is called the leaf We observe from the data that the stems for all scores are 5 6 7 8 and 9 because all the scores lie in the range 50 to 98

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 68: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 213 Stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 69: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-8 Solution After we have listed the stems we read the leaves for all

scores and record them next to the corresponding stems on the right side of the vertical line The complete stem-and-leaf display for scores is shown in Figure 214

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 70: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 214 Stem-and-leaf display of test scores

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 71: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-8 Solution The leaves for each stem of the stem-and-leaf display of

Figure 214 are ranked (in increasing order) and presented in Figure 215

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 72: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Figure 215 Ranked stem-and-leaf display of test scores

One advantage of a stem-and-leaf display is that we do not lose information on individual observations

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 73: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-9 The following data give the monthly rents paid by a sample of

30 households selected from a small town

Construct a stem-and-leaf display for these data

88012101151

1081 985 630

72112311175

1075 932 952

1023 8501100

775 8251140

12351000 750

750 9151140

96511911370

96010351280

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 74: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-9 SolutionFigure 216 Stem-and-leaf display of rents

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 75: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-10 The following stem-and-leaf display is prepared for the number of hours that 25 students spent working on computers during the last month

Prepare a new stem-and-leaf display by grouping the stems

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 76: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-10 SolutionFigure 217 Grouped stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 77: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-11 Consider the following stem-and-leaf display which has

only two stems Using the split stem procedure rewrite the stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 78: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-11 SolutionFigure 218 amp 219 Split stem-and-leaf display

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 79: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

DOTPLOTS Definition Values that are very small or very large relative to the

majority of the values in a data set are called outliers or extreme values

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 80: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-12

Table 216 lists the number of minutes for which each player of the Boston Bruins hockey team was penalized during the 2011 Stanley Cup championship playoffs Create a dotplot for these data

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 81: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Table 216 Number of Penalty Minutes for Players of the Boston Bruins Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 82: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-12 Solution

Step1 Draw a horizontal line with numbers that cover the given data as shown in Figure 220

Step 2 Place a dot above the value on the numbers line that represents each number of penalty minutes listed in the table After all the dots are placed Figure 221 gives the complete dotplot

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 83: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-12 Solution

As we examine the dotplot of Figure 221 we notice that there are two clusters (groups) of data Sixty percent of the players had 17 or fewer penalty minutes during the playoffs while the other 40 had 24 or more penalty minutes

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 84: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-13

Refer to Table 216 in Example 2-12 which lists the number of minutes for which each player of the 2011 Stanley Cup champion Boston Bruins hockey team was penalized during the playoffs Table 217 provides the same information for the Vancouver Canucks who lost in the finals to the Bruins in the 2011 Stanley Cup playoffs Make dotplots for both sets of data and compare them

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 85: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Table 217 Number of Penalty Minutes for Players of the Vancouver Canucks Hockey Team During the 2011 Stanley Cup Playoffs

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 86: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-13 SolutionFigure 222 Stacked dotplot of penalty minutes for the Boston Bruins and the Vancouver Canucks

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 87: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Example 2-13 Solution

Looking at the stacked dotplot we see that the majority of players on both teams had fewer than 20 penalty minutes throughout the playoffs Both teams have one outlier each at 63 and 66 minutes respectively The two distributions of penalty minutes are almost similar in shape

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 88: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 89: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

TI-84

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 90: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 91: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 92: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 93: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 94: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Minitab

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 95: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)
Page 96: CHAPTER 2 ORGANIZING AND GRAPHING DATA Prem Mann, Introductory Statistics, 8/E Copyright © 2013 John Wiley & Sons. All rights reserved.

Excel

Prem Mann Introductory Statistics 8E Copyright copy 2013 John Wiley amp Sons All rights reserved

  • CHAPTER 2
  • Opening Example
  • RAW DATA
  • Table 21 Ages of 50 Students
  • Table 22 Status of 50 Students
  • ORGANIZING AND GRAPHING DATA
  • Table 23 Types of Employment Students Intend to Engage In
  • Frequency Distributions
  • Example 2-1
  • Example 2-1 (2)
  • Example 2-1 Solution Table 24 Frequency Distribution of Favor
  • Relative Frequency and Percentage Distributions
  • Relative Frequency and Percentage Distributions (2)
  • Example 2-2
  • Example 2-2 Solution Table 25 Relative Frequency and Percenta
  • Case Study 2-1 Will Todayrsquos Children Be Better Off Than Their P
  • Graphical Presentation of Qualitative Data
  • Figure 21 Bar graph for the frequency distribution of Table 2
  • Case Study 2-2 Employeesrsquo Overall Financial Stress Levels
  • Graphical Presentation of Qualitative Data
  • Table 26 Calculating Angle Sizes for the Pie Chart
  • Figure 22 Pie chart for the percentage distribution of Table 2
  • ORGANIZING AND GRAPHING QUANTITATIVE
  • Table 27 Weekly Earnings of 100 Employees of a Company
  • Frequency Distributions (2)
  • Frequency Distributions (3)
  • Frequency Distributions (4)
  • Frequency Distributions (5)
  • Constructing Frequency Distribution Tables
  • Table 28 Class Boundaries Class Widths and Class Midpoints f
  • Example 2-3
  • Example 2-3 Solution
  • Table 29 Frequency Distribution for the Data on iPods Sold
  • Relative Frequency and Percentage Distributions (3)
  • Example 2-4
  • Example 2-4 Solution Table 210 Relative Frequency and Percent
  • Graphing Grouped Data
  • Figure 23 Frequency histogram for Table 29
  • Figure 24 Relative frequency histogram for Table 210
  • Case Study 2-3 How Long Does Your Typical One-Way Commute Take
  • Graphing Grouped Data (2)
  • Figure 25 Frequency polygon for Table 29
  • Case Study 2-4 How Much Does it Cost to Insure a Car
  • Figure 26 Frequency distribution curve
  • Example 2-5
  • Example 2-5 (2)
  • Example 2-5 Solution
  • Table 212 Frequency Relative Frequency and Percentage Distri
  • Example 2-6
  • Example 2-6 Solution Table 213 Frequency Distribution of Vehi
  • Figure 27 Bar graph for Table 213
  • Case Study 2-5 How Many Cups of Coffee Do You Drink a Day
  • SHAPES OF HISTOGRAMS
  • Figure 28 Symmetric histograms
  • Figure 29 (a) A histogram skewed to the right (b) A histogra
  • Figure 210 A histogram with uniform distribution
  • Figure 211 (a) and (b) Symmetric frequency curves (c) Frequen
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Example 2-7
  • Example 2-7 Solution Table 214 Cumulative Frequency Distribut
  • CUMULATIVE FREQUENCY DISTRIBUTIONS
  • Table 215 Cumulative Relative Frequency and Cumulative Percent
  • CUMULATIVE FREQUENCY DISTRIBUTIONS (2)
  • Figure 212 Ogive for the cumulative frequency distribution
  • STEM-AND-LEAF DISPLAYS
  • Example 2-8
  • Example 2-8 Solution
  • Figure 213 Stem-and-leaf display
  • Example 2-8 Solution (2)
  • Figure 214 Stem-and-leaf display of test scores
  • Example 2-8 Solution (3)
  • Figure 215 Ranked stem-and-leaf display of test scores
  • Example 2-9
  • Example 2-9 Solution Figure 216 Stem-and-leaf display of rent
  • Example 2-10
  • Example 2-10 Solution Figure 217 Grouped stem-and-leaf displa
  • Example 2-11
  • Example 2-11 Solution Figure 218 amp 219 Split stem-and-leaf d
  • DOTPLOTS
  • Example 2-12
  • Table 216 Number of Penalty Minutes for Players of the Boston
  • Example 2-12 Solution
  • Example 2-12 Solution (2)
  • Example 2-13
  • Table 217 Number of Penalty Minutes for Players of the Vancouv
  • Example 2-13 Solution Figure 222 Stacked dotplot of penalty m
  • Example 2-13 Solution
  • TI-84
  • TI-84 (2)
  • Minitab
  • Minitab (2)
  • Minitab (3)
  • Minitab (4)
  • Minitab (5)
  • Excel
  • Excel (2)