(1 point) Suppose a group of 700 smokers (who all wanted to give up smoking) were randomly assigned to receive an antidepressant drug or a placebo for six weeks. Of the 471 patients who received the antidepressant drug. 171 were not smoking one year later. Of the 229 patients who received the placebo, 51 were not smoking one year later. Given the null hypothesis H0 : (mmg mambo) = 0 and the alternative hypothesis H : (mmg ppmebo) a 0, conduct a test to see if taking an antidepressant drug can help smokers stop smoking. Use a = 0.03. (a) The test statistic is (b) The P-value is (c) The nal conclusion is O A. There is not sufcient evidence to determine whether the antidepressant drug had an effect on changing smoking habits after one year. Q B. There seems to be evidence that the patients taking the antidepressant drug have a different success rate of not smoking after one year than the placebo group