Answers to Practice Final Exam -- Winter 10

Part A:
 1. b    2. c    3. b    4. b    5. b
 6. b    7. c    8. b    9. c   10. 12.4%    11. 53.8%
12. b   13. c   14. b   15. b

Part B:
See midterm for how to do this problem.
A regression problem will not be on the final, only on the
makeup exam for the midterm.

Part D:
 
1a. The Before Diet weights are close to normal; slightly
    skewed to the left.  The After Diet weights are also
    close to normal and slightly skewed to the left.

1b. t = 3.707,  p = 0.008.  Reject the null hypothesis at the 5% level.

2a. The screw weights from Machine 1 are skewed to the right, whereas
    the screw weights from Machine 2 are skewed to the left.

2b. t = 1.959, p = 0.091.  Accept the null hypothesis at the 5% level.

Part E: