Which of the following comparisons would use a t-test comparing two independent

Question

Which of the following comparisons would use a t-test comparing two independent groups? A. Fifteen retirees with diagnosed hypertension are assigned a program of diet, exercise, and meditation. A baseline measurement of blood pressure is taken before the program begins and again after 2 months. Was the program effective in reducing blood pressure of the participants after analyzing the mean blood pressure before the program compared to mean blood pressure after the program? B. Comparing average GPA of male undergraduate students vs. average GPA of female undergraduate students C. Comparing average age of freshman, sophomores, juniors, and seniors. D. Comparing the average GPA of economics majors, biology majors, and computer science majors.

Explanation / Answer

In Option A, the samples are dependent because we are doing the test before and after the program.

In Option C and D, there are more than two categories to compare so we can't apply t test there.

Hence,

Option B is correct.

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