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 210 patients who received the antidepressant drug, 67 were not smoking one year later. Of the 590 patients who received the placebo, 58 were not smoking one year later. Given the null hypothesis Ho: (Pdrug-Pplacebo) = 0 and the alternative hypothesis  Ha: ( Pdrug-Pplacebo) ≠ 0 conduct a test to see if taking an antidepressant drug can help smokers stop smoking.  use a = 0.05  a) test statistic  b) p- value

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.