AP Statistics: Exploring TwoVariable Data Practice Test
AP Statistics: Exploring TwoVariable Data Practice Test
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Question 1 of 19
1. Question
What would be the correlation between study time and test grades?
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Question 2 of 19
2. Question
The linear regression equation is y=61.93 x−1.79 . Identify the yintercept of the equation
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Question 3 of 19
3. Question
What type of correlation does this graph show?
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Question 4 of 19
4. Question
The residual plots from five different least squares regression lines are shown
below. Which of the plots shows the strongest evidence that its regression line is
an appropriate model for the data and is consistent with the assumptions
required for inference for regression?CorrectIncorrect 
Question 5 of 19
5. Question
The following computer output describes the relationship between y = height (in cm) and x = foot length (also in cm) for 12 randomly selected students from the British Census @ Schools database. The scatterplot for this relationship show a roughly linear shape. Which of the following is an equation of leastsquares regression line for these data?
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Question 6 of 19
6. Question
Is there a relationship between reaction time and age? A statistics student measures the reaction time of 12 subjects by measuring how far a yardstick drops, in inches, before a subject catches it between his or her thumb and forefinger (a high number thus indicates a slow reaction time). The student plans to use linear regression to see if reaction time can be predicted by the age of thesubject. Output from a computer regression analysis is given below. The tion of the leastsquares regression line is…
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Question 7 of 19
7. Question
A study of the effects of television measured how many hours of television each of 125 grade school children watched per week during a school year and their reading scores. The study found that children who watch more television tend to have lower reading scores than children who watch fewer hours of television. The study report says, “Hours of television watched explains 25% of the observed variation in the reading scores of the 25 subjects.” The correlation between hours of TV and reading score must be…
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Question 8 of 19
8. Question
If two variables are positively associated, then…
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Question 9 of 19
9. Question
If stopping distance was expressed in yards instead of feet, how would the correlation r between temperatures and stopping distance change?
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Question 10 of 19
10. Question
A study is conducted to determine if one can predict the yield of a crop based on the amount of fertilizer applied to the soil. The response variable in this study is…
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Question 11 of 19
11. Question
Which one of the following statement is correct?
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Question 12 of 19
12. Question
“Leastsquares” in the term “leastsquares regression line” refers to…
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Question 13 of 19
13. Question
Which of the following statements concerning residuals is true?
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Question 14 of 19
14. Question
Which of the following is correct?
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Question 15 of 19
15. Question
A fisheries biologist studying whitefish in a Canadian Lake collected data on the length (in centimeters) and egg production for 25 female fish. A scatter plot of her results and computer regression analysis of egg production versus fish length are given below.On average, how far are the predicted yvalues from the actual yvalues?
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Question 16 of 19
16. Question
The regression line for the twovariable data set given above is ^ y =2.35+ 0.86 x . What is the value of the residual for the point whose xvalue is 29?
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Question 17 of 19
17. Question
A basketball coach wants to determine if a player’s height can predict the number of points the player scores in a season. Which statistical test should the coach conduct?
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Question 18 of 19
18. Question
In a regression analysis, the yvariable should be the _____________ variable, and the xvariable should be the _____________ variable.
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Question 19 of 19
19. Question
Which of the following correlation coefficients indicates the strongest relationship between variables?
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