2. Suppose you wanted to compare the depression level among those who mediate fo

Question

2. 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. a. You want to compare the mean change from baseline in Beck score in the meditation and exercise groups. Which test would you use? (Ipt) b. 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? (1 pt c. 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? Ipt) d. Which of the following design features were included in this study? List all of the following, and circle the ones that apply: 1pt) Balance Control group Blinding Randomization e. Suppose you expect gender to be a possible confounding variable in this study. Explain how you can block by gender. 1pt Copyright 2015 Dept. of Statistics and Data Sciences, UT Austin

Explanation / Answer

2. a) 2-Sample t test. The experiment follows, Independent Group assumption (two groups-meditation and exercise), Independence Assumption (depression of either group is independent of another), Randomization condition (subjects are randomly assigned to treatment groups) and Nearly normal condition.

b) 1-sample t test. [One sample-mediation group is condidered and mean Beck score pre and post meditation is compared to see significant reduction].

c) 2-proportion Z test. Here proportion of peopl efeeling better in either of the groups at the end of the study is compared.

d) Randomization. The experiment was randomized, subjects were assigned randomly to treatment groups.

e) The experiment can be done by creating two blocks-male and female, and then randomly assign the male and female subjects to either of the treatment groups and finally measure the Beck depression scores.

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