Suppose a group of 800 smokers (who all wanted to give up smoking) were randomly assigned to receive an antidepressant drug or a placebo for six weeks. Of the 126 patients who received the antidepressant drug, 20 were not smoking one year later. Of the 674 patients who received the placebo, 164 were not smoking one year later. Given the null hypothesisH0: (pdrug pplacebo)=0 and the alternative hypothesisHa:(pdrugpplacebo)0, conduct a test to see if taking an antidepressant drug can help smokers stop smoking. Use=0.03

(a) The test statistic is

(b) The P-value is