Ms. Drake 7th grade Math Measures of Central Tendency Lesson 4 Frequency Tables and Stem and Leaf...
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Transcript of Ms. Drake 7th grade Math Measures of Central Tendency Lesson 4 Frequency Tables and Stem and Leaf...
Ms. Drake 7th grade Math
Measures of Central Tendency
Lesson 4
Frequency Tables and Stem and Leaf Plots
Week by Week Essentials
http://mathlearnnc.sharpschool.com/cms/One.aspx?portalId=4507283&pageId=5149151
Go to: Resources for Mathematics: Grade 7 (2003
SCS)Week by Week Essentials
Measures of Central Tendency Vocabulary
Bar graphBox- and-Whisker PlotCircle GraphCumulative FrequencyDouble Bar GraphFirst QuartileFrequency Table
Measures of Central Tendency Vocabulary
HistogramLine GraphLower ExtremeMeanMedianModeNegative CorrelationNo correlation
Measures of Central Tendency Vocabulary
OutlierPopulationPositive correlationRandom SampleRangeSample
Measures of Central Tendency Vocabulary
Scatter PlotSecond QuartileSectorStem-and-Leaf PlotThird QuartileUpper Extreme
Frequency Tables
A table that lists items together according to the
number of times, or frequency, that the items
occur.
Frequency TableA frequency table is a way to organize data into categories,
groupsor intervals.
By including a cumulative frequency column in your table
you can keep a running total of the frequencies in each
interval.
Reading A Frequency Table
How many chickens owned per family
Frequency Cumulative Frequency
0-5 /// 36-11 ////// 9
12-17 //// 1318-23 // 15
How to Make a Frequency Table
Collect DataAverage Rainfall per Month in
Malaysia in millimeters:158, 201, 259, 292,
224,130,99,163, 218, 249, 259, 191
First determine the intervals, that is, how are you going to break up or group the data?
158, 201, 259, 292, 224,130,99,163, 218, 249, 259,
191The range is between
99 to 292Intervals must be even.
So intervals of 99?
0-99100-199200-299
Put data in the right interval158, 201, 259, 292,
224,130,99,163, 218, 249, 259, 191
Amount of Rainfall
Frequency Cumulative Frequency
0-99100-199200-299
Amount of Rainfall
Frequency Cumulative Frequency
0-99 / 1100-199 //// 5200-299 //// // 12
Does not give you exact data info
Let’s try this website together.
http://www.ixl.com/math/practice/grade-7-create-frequency-charts
A Stem and Leaf Plot can be used to show how often data values occur and how they
are distributed.
Minutes Doing HomeworkStems Leaves
2 1 2 6 9 3 2 2 5 6 8 4 3 5 5 5 7 8 5 6 4
The stems
are the tens
digits
There are no data values in
the 50’s
The leaves
are the
ones digits
Venezuela 21Columbia 35Ecuador 23
Peru 24Bolivia 11
Chile 5Argentina 20
Uruguay 6Paraguay 13
Brazil 64French Guiana 6
Suriname 5Guyana 6
Numbers of Endangered Species
21, 35, 23, 24, 11, 5, 20, 6, 13, 64, 6, 5, 6
Endangered
Species
5 5 6 6 6 1
1 3
2
0 1 3 4
3
5
4 5 6
4
Stem Plots
Here is a great website to help you practice how to read and interpret stem and leaf
plots.
http://www.shodor.org/interactivate/activities/StemAndLeafPlotter
/
Try this on your own.
http://www.glencoe.com/sec/math/studytools/cgi-bin/msgQuiz.php4?isbn=0-02-833050-1&chapter=2&lesson=1