Suppose you wanted to compare the depression level among those who mediate for 1

Question

Suppose you wanted to compare the depression level among those who mediate for 15 minutes a day and those who exercise for 30 minutes a day. You enroll into your study, 80 patients who have been diagnosed with depression, and randomly assign 42 people to the meditation group, and 38 people to the exercise group. The study period is one month. You measure the Beck depression score for each of the 80 patients at the start of the study, and again measure their Beck depression score at the end of the study. You want to compare the mean change from baseline in Beck score in the meditation and exercise groups. Which test would you use? Using the Beck scores recorded at baseline and post-treatment, you want to see if there has been a significant reduction in depression among just the patients in the meditation group. Which test would you use? You make a note of whether or not a patient felt better at the end of the study with respect to their depression, and want to compare the proportion of patients who feel better in each of the groups (meditation vs. exercise). Which test would you use? Which of the following design features were included in this study? List all of the following, and circle the ones that apply: Control group Blinding Balance Randomization Suppose you expect gender to be a possible confounding variable in this study. Explain how you can block by gender.

Explanation / Answer

a)

As you randomly assigned some patient in meditation group and some of them in exercise group, the two score set is indeopendent of each other. So to test for ddifference in mean score in two groups we have to conduct independent sample t-test.

b)

Now we are concentrating on the meditation group and we want to compare the past score and after meditation score. So the pre-meditation score set and post-meditation score sets are correlated as it is score set for same set fo individual. So it will be Paired sample t-test.

c) here we are calculating the proportion of individual who feel better after doing exercise or meditation in each group and we want to compare the proportion, and note that the proportion in the meditation group will be independent of exercise group. So it will be Test of proportion of two independent sample.

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