A professor of women's studies is interested in determining if stress affects the menstrual cycle. Ten women are randomly sampled for an experiment and randomly divided into two groups. One of the groups is subjected to high stress for two months while the other lives in a relatively stress-free environment. The professor measures the menstrual cycle (in days) of each woman during the second month. The following data are obtained. Assume you are evaluating H ₀ using the t test. The df for determining t crit are _________. A) 4 B) 9 C) 8 D) 3

Question

Quizplus · Accepted Answer

The degrees of freedom for an independent samples t-test are calculated as (n1 + n2) - 2, where n1 is the sample size of group 1 and n2 is the sample size of group 2. In this case, both groups have a sample size of 5, so the degrees of freedom are (5 + 5) - 2 = 8. Therefore, the correct answer is C) 8.

A Professor of Women's Studies Is Interested in Determining If