Exam II ANOVA

Exam II ANOVA - HP 340 Fall 09 Practice ANOVA problems 1. A...

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HP 340 Fall 09 Practice ANOVA problems 1. A clinical psychologist is interested in comparing the effectiveness of short-term relaxation and cognitive-behavioral therapy in treating mild depression. An experiment is conducted in which 15 patients with mild depression are selected and 5 are randomly assigned to a relaxation therapy group, 5 a cognitive/behavioral therapy group, and 5 an attention placebo group. Following 10 weeks of treatment, the following depression scores were obtained. Higher scores indicate higher levels of depression. Are there differences in depression among the treatment groups? If so, what treatment seems to be the most effective (i.e. has the least depression)? Group means and variances are given in the final row. Cognitive/Behavioral Relaxation Attention-Placebo Therapy Therapy Group 5 6 8 6 8 10 8 10 9 4 9 10 7 7 9 Grand mean= 7.73, Overall Var=3.50 a. What is the alternative hypothesis ( H a )? (1 point) b. What is the null hypothesis ( H o )? (1 point) c. Using the above data, fill in the provided source table. (9 points) Source SS df MS F obt Therapy Error Total 1
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This note was uploaded on 03/27/2010 for the course HP 340L at USC.

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Exam II ANOVA - HP 340 Fall 09 Practice ANOVA problems 1. A...

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