Scatter Plots9-9
Warm UpWarm Up
Lesson PresentationLesson Presentation
Problem of the DayProblem of the Day
Lesson QuizzesLesson Quizzes
Scatter Plots9-9
Warm Up
Graph each point on the same coordinate plane.
1. A (5, 20)
2. B (20, 15)
3. C (10, 40)
4. D (30, 35)A
B
CD
Scatter Plots9-9
Problem of the DayWhat is the least number that can be divided evenly by each of the numbers 1 through 12?
27,720
Scatter Plots9-9
Learn to create and interpret scatter plots.
Scatter Plots9-9
Vocabulary
scatter plotcorrelationline of best fit
Scatter Plots9-9
A scatter plot is a graph with points plotted to show a relationship between two sets of data.
Correlation describes the type of relationship between two data sets.
Scatter Plots9-9
Positive correlation: both data sets increase together.
Negative correlation: as one data set increases, the other decreases.
No correlation: changes in one data set do not affect the other data set.
Scatter Plots9-9
Use the given data to make a scatter plot of the weight and height of each member of a basketball team, and describe the correlation.
Additional Example 1: Making a Scatter Plot of a Data Set
The points on the scatter plot are (71, 170), (68, 160), (70, 175), (73, 180), and (74, 190).There is a positive correlation between the two data sets.
Scatter Plots9-9
Use the given data to make a scatter plot of the weight and height of each member of a soccer team, and describe the correlation.
Check It Out: Example 1
12062
13568
17569
15667
12563
Weight (lbs)Height (in)200
190
180
170
160
150
140
130
120
60 61 62 63 64 65 66 67 68 69
The points on the scatter plot are (63, 125), (67, 156), (69, 175), (68, 135), and (62, 120). Height
Weig
ht
There is a positive correlation between the two data sets.
Scatter Plots9-9
Make a scatter blot of the data, and draw a line of best fit. Then use the data to predict how much a worker will earn in tips in 10 hours.
Additional Example 2: Using a Scatter plot to Make Predictions
Tips earned may be dependent on the number of hours worked.
Step 1: Make a scatter plot.
Let hours worked represent the independent variable x and tips earned represent the dependent variable y.
Scatter Plots9-9Additional Example 2 Continued
Step 2: Draw a line of best fit.
Draw a line that has about the same number of points above and below it.
Scatter Plots9-9Additional Example 2 Continued
Step 3: Make a prediction.
According to the graph, working 10 hours will earn about $24 in tips.
Find the point on the line whose x-value is 10. The corresponding y-value is about 24.
Scatter Plots9-9
Use the data to predict how many circuit boards a worker will assemble in 10 hours.
Check It Out: Example 3
According to the graph, a worker will assemble approximately 10 circuit boards in 10 hours.
Hours Worked
4 8 6 9 11
Circuit Board Assemblies
2 7 5 8 12
141210 8 6 4 2
2 4 6 8 10 12 14
Hou
rs
Circuit Board Assemblies
Scatter Plots9-9
Standard Lesson Quiz
Lesson Quizzes
Lesson Quiz for Student Response Systems
Scatter Plots9-9
Lesson Quiz: Part I
1. Use the given information to make a scatter plot, and describe the correlation.
Grading Period 1 2 3 4
Number of A’s 5 6 8 10
positive correlation
Scatter Plots9-9
Lesson Quiz: Part II
2. Draw a line of best fit for the scatter plot you drew in Problem 1. Then use the data to predict the number of A’s in grading period 6.
approximately 13 A’s
Scatter Plots9-9
1. Identify a scatter plot for the given data.
A. B.
Lesson Quiz for Student Response Systems
Scatter Plots9-9
2. Do the data sets have a positive, a negative, or no correlation?distance covered and time taken at constant speed
A. positive
B. negative
C. none
Lesson Quiz for Student Response Systems
Scatter Plots9-9
3. Do the data sets have a positive, a negative, or no correlation?value of a used car and the total distance traveled
A. positive
B. negative
C. none
Lesson Quiz for Student Response Systems
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