In a study on the effectiveness of therapy in treating depression, participants in the cognitive-behavioural therapy group scored significantly lower than patients in the behavioural therapy group. This difference is referred to as:
A)The third variable problem
B)The directionality problem
C)Within-group variance
D)Between-group variance

Question

Quizplus · Accepted Answer

The difference between the scores of the two therapy groups is referring to the variance between the groups, not within them. Therefore, the correct option would be between-group variance. The third variable problem refers to the possibility of a third variable causing the observed effects, while the directionality problem refers to the uncertainty of which variable is causing the effect.

In a Study on the Effectiveness of Therapy in Treating