Question: Use descriptive statistics on the subjects involved in the study described in previous problem.

a. Generate a 95% CI for the mean age among persons assigned to the placebo.

b. Generate a 95% CI for the difference in mean ages in patients assigned to the experimental versus the placebo groups.

c. Generate a 95% CI for the difference in mean BMI in patients assigned to the experimental versus the placebo groups.

Medication Placebo

(n = 100) (n = 100)

Mean (SD) age (yrs) 47.2 (4.3) 46.1 (5.1)

Men (%) 46% 58%

Mean (SD) educational 13.1 (2.9) 14.2 (3.1)

Mean (SD)annual $36,560 ($1054) $37,470 ($998)

Income

Mean (SD) body mass 24.7 (2.7) 25.1 (2.4)

Index (BMI)