Exam 3 Answer Key –
Solutions to Form B appear next. You can find the corresponding questions in Forms A and D to figure
out how to do the problems.
Form B
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
D
E
C
A
D
E
D or A
B
C or B
E
D
A
C
C
B
D
D
E
C
A
A
B
A
C
D
B
E
A
D
A
A
A
D 33-37 1pt each
E
A
B
C
Form A
1. E
1-5 1pt each
2. A
3. D
4. B
5. C
6. C
7. A
8. E
9. E
10. B
11. E
12. D
13. A
14. C
15. D
16. D
17. D
18. E
19. D
20. A
21. A
22. B
23. C
24. C or E
25. E
26. A or D
27. B
28. B
29. A
30. B
31. D
32. A or C (TYPO)
33. A
34. B
35. A
36. C
37. D
Form D
1. A
1-5 1pt each
2. D
3. C
4. B
5. E
6. A
7. C
8. E
9. D
10. C
11. A
12. E
13. E
14. B
15. D
16. A
17. A
18. D
19. D
20. D
21. E
22. C or E
23. C
24. B
25. A or D
26. B
27. B
28. E
29. C
30. A
31. B
32. B D correction
33. B
34. C
35. B
36. A
37. D
NOTE: For the model selection problem I decided to give credit to students who said the model with 2
variables is better. Even though its R2 adjusted is lower, it’s only marginally so, and it is a more
parsimonious model.