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Scatter Plot
A graph that shows the relationship between two sets of data
Correlation
Describes the relationship between two data sets
Can be positive, negative or non existent
Do the data sets have a positive negative or no correlation?
The number of weeks that a movie has been in theaters and its weekly box office
The number of weeks a movie has been in theaters and its total revenue
The number of weeks a movie has been in theaters and the amount it cost to make
Line of Best Fit
A straight line that comes closest to the points on a scatter plot
Can be used to predict values
Class Size Avg. Grade(%)
A 26 86
B 35 72
C 24 88
D 30 80
E 27 84
Use the data about class size and average grade to make a scatter plot:
A researcher studied the number of hours a group of
students spent on the internet each week and their grades in a history class. Make a scatter plot of the data:
Hours on the
Internet
4
2
1
3
5
Student
A
B
C
D
E
Grade (%)
94
85
96
77
88
Draw a line of best fit and use it to predict the height at age 24
Draw a line of best fit and use it to predict the homework score needed to get a 75 on the test
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