1. Suppose a group of 1000 smokers (who all wanted to give up smoking) were randomly assigned to receive an
antidepressant drug or a placebo for six weeks. Of the 455 patients who received the
antidepressant drug, 138 were not smoking one year later. Of the 545
patients who
received the placebo, 214 were not smoking one year later. Given the null hypothesis [math]

(a) The rejection region is [math]

(b) The test statistic is [math]

The final conclusion is

** A. ** We can reject the null hypothesis that [math]** B. ** There is not sufficient evidence to reject the null hypothesis that [math]

2. Construct the 95% confidence interval for the difference between
the proportions of those who gave up smoking with and without the
antidepressant drug.

Which of the following is the correct interpretation for your answer
in part 2?
** A. ** There is a 95% chance that the difference
between the proportions of smokers who gave up smoking with and without
the antidpressant drug lies in the interval** B. ** We can be 95%
confident that the difference between the proportions of
smokers who gave up smoking with and without the antidpressant drug lies in
the interval** C. ** We can be 95% confident that the difference
between the proportions of smokers who gave up smoking with and without
the antidpressant drug lies in the interval** D. ** None of the above

Your overall score for this problem is