Question

A researcher is interested in comparing the effects of two therapies often used to treat the symptoms of Post-Traumatic Stress Disorder. Volunteers with PTSD are randomly divided into three groups. One group is a control group, and their "therapy" consists of simply talking to an experimental confederate about everyday subjects. Another group participates in a type treatment that might generally be considered Humanistic Another group participates in a type of treatment that might generally be considered Cognitive-Behavioral. Each participant is then rated for symptom severity, with higher scores indicating greater severity. The data are as follows. (fictional data) Therapy Condition Control Humanistic Cog-Behav. 10 7 9 8 10 9 6 5 10 6 5 4 6. What is the test statistic (F)? Choose the closest option. A) C) 2.5 E) 10 B) 1 D) 5 7. Using the significance level, what is the correct decision in regards to the null hypothesis? A) Null Proven True C) Reject Null E) Research Hypothesis Proven True B) Null Proven False D) Fail to Reject Null 8. If there is significance at the .05 level, please describe the relationship between the variables. A) type of therapy administered has an impact on symptom severity B) symptom severity impacts type of therapy administered C) as symptom severity goes up, therapy goes down D) the cognitive behavioral group is different than the other two groups 9. Using the .01 significance level, what is the correct decision in regards to the null hypothesis? A) Null Proven True C) Reject Null E) Research Hypothesis Proven True B) Null Proven False D) Fail to Reject Null 10. Using the.001 significance level, what is the correct decision in regards to the null hypothesis? A) Null Proven True C) Reject Null E) Research Hypothesis Proven True B) Null Proven Fake D) Fail to Reject Null

Answer 1

6. 5

7. Reject Null

8. Option A

9. Fail to Reject Null

10. Fail to Reject Null

Source	SS	df	MS	F	p-value
Treatment	28.17	2	14.083	5.12	.0327
Error	24.75	9	2.750
Total	52.92	11