1. Foa, Rothbaum, Riggs, and Murdock (1991) conducted a study evaluating four different types of therapy for rape victims. The Stress Inoculation Therapy (SIT) group received instructions on coping with stress. The Prolonged Exposure (PE) group went over the events in their minds repeatedly. The Supportive Counseling (SC) group were taught a general problem-solving technique. Finally, the Waiting List (WL) control group received no therapy. Data with the same characteristics as theirs follow, where the dependent variable was the severity rating of a series of symptoms.

Group	n	Mean	S.D.
SIT	14	11.07	3.95
PE	10	15.40	11.12
SC	11	18.09	7.13
WL	10	19.50	7.11

1. (4 points) The analysis of variance (ANOVA) was run, and the results are in the following table. Draw whatever conclusions are warranted. Interpret what the conclusions mean.

Source	df	SS	MS	F
Treatment	3	507.840	169.280	3.04*
Error	41	2279.067	55.587
Total	44	2786.907
* p < .05

1. (4 points) The Bonferroni test was run to compare the WL group with each of the other three groups. The results are in the following table. What would you conclude? How does this compare to the answer to part a?

WL versus SIT	WL versus PE	WL versus SC
t = 2.73	t = 1.23	t = 0.433

The critical value of the Bonferroni test is 2.50.