Final exam review

Suggested answers

1. 2. 0
2. 3. summarize
3. 3. BLANK 1: generate, BLANK 2: "bootstrap"
4. 2. (-0.10, 0.10)
5. 3. We are 95% confident that the mean number of texts per month of all American teens is between 1450 and 1550.
6. 4. All of the above.
7. 2. Fail to reject the null.
8. 1. Reject the null.
9. 3. Categorical with two levels.
10. 1. False positive.
11. 2. The variability of a statistic across different samples from the same population.
12. 2. 2.5%
14. 3. R-squared of Model I > R-squared of Model II
15. 1. I > II
16. False. Increasing the sample size decreases the standard error of the sample statistic, and hence the width of the confidence interval – not the number of bootstrap samples.
17. True.