In an effort to determine the effectiveness of light therapy

In an effort to determine the effectiveness of light therapy to alleviate depression, you recruit a group of individuals who have been diagnosed with depression. The participants are randomly assigned to one of two groups: Group 1 will be the control group—members of this group will receive no light therapy. Members of Group 2 will get light therapy for 1 hour on even-numbered days over the course of 1 month. After 1 month, 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 04 – Exercise 04A.sav
Variable: Group
Definition: Group number
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)
a. Write the hypotheses.

b. Run each criterion of the pretest checklist (normality, homogeneity of variance, and n) and discuss your findings.
c. Run the t test and document your findings (ns, means, and Sig. [p value]).
d. Write an abstract under 200 words detailing a summary of the study, the t test results, hypothesis resolution, and implications of your findings.


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