1. AP Statistics
Chapter 3 Review

2. 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

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

4. 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

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

6. 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

7. 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

8. 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

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

10. 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

11. 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

12. 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

13. 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