1. AP Statistics
Chapter 3 Review

2. As the ellipse formed by points on a scatterplot becomes thinner, the strength of the correlation between the scores:
Becomes lower
Becomes higher
Remains constant
Becomes zero 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

3. The lowest strength of correlation of the following is:
0.26
-0.45
0.05
-0.90 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

4. The following are resistant:
Least squares regression line
Correlation coefficient
Both of the above
Neither of the above
It depends 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

5. Fastest Responders (in seconds)
23.64
Participant 1
34.13
Participant 4
34.5
Participant 12
42.24
Participant 11
42.53
Participant 14

6. Which of the following would not be a correct interpretation of r = -
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. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

7. Equation for LSRL is y-hat = 1. 3 +0. 73x
Equation for LSRL is y-hat = x . What is the residual for the point (4,7)?
2.78
3.00
4.00
4.22
7.00 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

8. Imagine two boys on a seesaw moving up and down
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 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

9. Participant Scores 600 Participant 11 500 Participant 7 Participant 8

10. If the correlation between X and Y is 0.94, which is true?
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 6 7 8 9 10 11 12 13 14 15 16 17

11. A residual plot for linear data looks linear.
True
False 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

12. Test A results correlate -0
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.
True
False 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

13. Fastest Responders (in seconds)
7.8
Participant 4
9.55
Participant 9
10.77
Participant 12
11.16
Participant 3
11.34
Participant 1

14. 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 6 7 8 9 10 11 12 13 14 15 16 17

15. If the coefficient of determination between two variables is 0
If the coefficient of determination between two variables is 0.81, then the correlation is 0.90.
True
False
It depends 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

16. A point on a scatterplot represents:
Two scores of 2 people.
One score made by 2 different people.
Two different scores of 1 person.
One score of 1 person. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

17. Participant Scores 900 Participant 14 Participant 17 800 Participant 1