ANSWERS TO PRACTICE FINAL

1. No, correlation is not causation.

2. 319

3. 0.8

4. 28.1%

5. (.281)^3 = 2.2%

6. Prediction = 26.4 in, new SD = 3.6 in, z = 0.31, prob = 37.8%

7. Prediction = 17.9 in, new SD = 2.4 in, z = 0.06, prob = 47.6%

8. 1000/13 or 76.9

9. SE = 8.43, z = 0.96, prob = 16.9% (answer may differ if you use a continuity correction).

10. 56.9% to 63.1%

11. CI for average: 0.739 to 0.861. CI for total is 35000 times this: 25900 to 30100.

12. Impractical or impossible: no master list of Americans exists, too expensive

13. 60.34 inches to 60.66 inches

14. Chi-square

15. The wheel is biased

16. 5.7%