Quantative Methods in Psych- What Am I doing Wrong?

Using a 2x2 design, a researcher compared two types of psychotherapy for Generalized Anxiety Disorder: Interpersonal Therapy (IPT) &Cognitive Behavior Therapy (CBT). Additionally half the participants in each form of psychotherapy got a daily dose of Klonopin (an anti-anxiety medication) or placebo. There were 6 participants in each of the four groups. Results were measured with an index of relaxation. Higher scores equaled greater relaxation. Participants in the IPT/placebo group averaged 22. Participants in the IPT/Klonopin group averaged 26. Participants in the CBT/placebo group averaged 26. Participants in the CBT/Klonopin group averaged 42. The sum of squares within group is 800. The overall mean is 29. To be correct, degrees of freedom, between and within groups & p values have to be correct. F should be correct to within .10 of the right answer. (This last is to allow for rounding error.) Which of the following is the correct F for the interaction of Drug and Psychotherapy?