Obsessive-Compulsive Disorder The contingency table shows the results of a random sample of patients with obsessive-compulsive disorder after being treated with a drug or with a placebo. At a = 0.10, perform a homogeneity of proportions test on the claim that the proportions of the results for drug and placebo treatments are the same.
25. Is the chi-square homogeneity of proportions test a left-tailed, right-tailed, or two-tailed test?
26. Explain how the chi-square independence test is different from the chi-square homogeneity of proportions test.