
Chapter 3 AP Stats Review
Authored by Anthony Clark
Mathematics
12th Grade

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14 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
If bivariate data set A has correlation r = 0.95, and a second bivariate data set B has correlation r = –0.95, then
a linear model does a better job of describing the relationship between the variables in data set A than in data set B.
a linear model does a better job of describing the relationship between the variables in data set B than in data set A.
a linear model is the best description of the relationship between the variables in both data set A and data set B.
you can’t tell whether either data set is best described by a linear model until you examine the scatterplots.
a mistake has been made—r cannot be negative.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A copy machine dealer has data on the number of copy machines x at each of 89 customer locations and the number of service calls in a month y at each location. Summary calculations give x̅= 8.4, sx= 2.1, y̅= 14.2, sy= 3.8, and r = 0.86. What is the slope of the least-squares regression line of number of service calls on number of copiers?
0.86
1.56
0.48
2.82
cannot tell from the information given
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Suppose we fit a least-squares regression line to a set of data. What is true if a plot of the residuals shows a curved pattern?
a straight line is not a good model for the data
the correlation must be 0
the correlation must be positive
outliers must be present
The regression line might or might not be a good model for the data, depending on the extent of the curve.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Estimate the correlation coefficient.
r = -0.8
r = -0.5
r = 0.5
r = 0.8
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
3)
A
B
C
D
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The scatter plot in the figure below shows the GPA of the students of a class versus their commute time. Which of the following statements is true?
The relationship between GPA and commute time is moderate positive linear.
The relationship between GPA and commute time is moderate negative linear.
The scatter plot does not have any outliers.
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