For this exercise, let's assume that you are setting up this study, rather than being called in after the fact

For this exercise, let's assume that you are setting up this study, rather than being called in after the fact. A review of the clinic's records indicates that their 8-week diet produces an average weight loss of 3.1 kg, with a standard deviation of ? 2.4 kg. If we desire to measure a large effect (Cohen's d ? 0.8), then the mean difference between groups (our desired effect size) should be at least:

0.8 x 2.4 = 1.92 kg

QUESTIONS TO ANSWER
? Description of data analysis procedures (one paragraph)
? Selection/justification of your basic statistical approach
? Any modification made based on your test(s) of assumptions
? Description of findings (paragraph or two)
? Summary table comparing groups
? Accompanying narrative statement on CI of differences and t-test
? Description of effect size and power of the analysis
? Compute the Number of Subjects Needed to Achieve a Given Power and Effect