Participants Were Randomly Allocated to One of Two Stress Management

Multiple Choice

Participants were randomly allocated to one of two stress management therapy groups, or a waiting list control group. Their baseline levels of stress were measured before treatment, and again after 3 months of weekly therapy sessions. Based on the output below, which of the following statements is the most accurate?

A) Levene's test was non-significant, F(2, 12) = .82, p = .47, and so the results must be treated with caution.
B) The type of therapy given did not have a significant effect on stress levels, after baseline stress level had been accounted for, F(2, 11) = 5.98, p = .52.
C) The type of therapy administered had a significant effect on stress levels, even after baseline levels of stress had been accounted for, F(1, 11) = 23.16, p < .001.
D) The type of therapy administered had a significant effect on stress levels, even after baseline levels of stress had been accounted for, F(2, 11) = 5.98, p = .017.