Hello! I need help solving this two-part problem. In clinical experiments involving distinct groups of independent samples, the groups must be similar in the important ways that affect the experiment. In an experiment designed to test the effectiveness of paroxetine for treating bipolar depression, subjects were studied using the Hamilton depression scale with the summary results given below (based on data from a "Double-Blind, Placebo-Controlled Comparison of Imipramine and Paroxetine in the Treatment of Bipolar Depression," by Nemeroff et al., American Journal of Psychiatry, Vol. 158, No. 6). [lower scores indicate lower depression]