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In an effort to determine the effectiveness of light therapy to alleviate depression, you recruit a group of subjects who have been diagnosed as depressed. The subjects are randomly assigned to one of two groups: The control group will receive no light therapy, and the treatment group will get light therapy for 1 hour on even-numbered days over the course of 1 month, at which time all participants will complete the Acme Mood Scale, consisting of 10 questions; this instrument renders a score between 1 and 100 (1 = extremely bad mood, 100 = extremely good mood).

Data set: Ch 05 – Exercise 07A.sav Codebook Variable: group Definition: Light therapy group assignment Type: Categorical (1 = No light therapy, 2 = Light therapy: even days) Variable: mood Definition: Acme Mood Scale Type: Continuous (1 = extremely bad mood, 100 = extremely good mood)

1. Write the hypotheses.

2. Run each criterion of the pretest checklist (normality, homogeneity of variance, and n) and discuss your findings.

3. Run the t test and document your findings (ns, means, and significance [p value]).

4. Write an abstract up to 200 words detailing a summary of the study, the t test results, hypothesis resolution, and implications of your findings.

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