# AP Statistics Chapter 3 Review.

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AP Statistics Chapter 3 Review

1. As the ellipse formed by points on a scatterplot becomes thinner, the strength of the correlation between the scores: 10 Becomes lower Becomes higher Remains constant Becomes zero 1 2 3 4 5

2. The lowest strength of correlation of the following is:
0.26 -0.45 0.05 -0.90 10 1 2 3 4 5

3. The following are resistant to outliers:
Least squares regression line Correlation coefficient Both of the above Neither of the above It depends 10 1 2 3 4 5

4. Which of the following would not be a correct interpretation of r = -.30?
Variables are inversely related. Coefficient of determination is .09. 30% of variation between variables is linear. There is a weak relationship between the variables. All above are correct. 10 1 2 3 4 5

5. Equation for LSRL is y-hat = 1. 3 +0
5. Equation for LSRL is y-hat = x What is the residual for the point (4,7)? 2.78 -2.78 1.30 -4.22 7.00 10 1 2 3 4 5

6. Imagine two boys on a seesaw moving up and down
6. Imagine two boys on a seesaw moving up and down. The r value of their heights off the ground would be: 0.00 1.00 -1.00 0.50 -0.50 10 1 2 3 4 5

7. If the correlation between X and Y is 0.94, which is true?
10 X causes Y Y causes X Low scores on X are associated with high scores on Y Low scores on X are associated with low scores on Y. 1 2 3 4 5

8. A residual plot for linear data looks linear.
10 True False 1 2 3 4 5

9. Test A results correlate -0
9. Test A results correlate with results on the Nat’l Merit Scholarship exam. Because of the negative sign, this relationship is considered to be weak. 10 True False 1 2 3 4 5

10. Switching the explanatory and response variables on a scatterplot affects the
Correlation LSRL Both the above Neither the above It depends 1 2 3 4 5

11. If the coefficient of determination between two variables is 0
11. If the coefficient of determination between two variables is 0.81, then the correlation is 0.90. 10 True False It depends 1 2 3 4 5

12. A point on a scatterplot could represent:
Two scores of 2 people. One score made by 2 different people. Two different scores of 1 person. One score of 1 person. 10 1 2 3 4 5