Hearing anecdotal reports that some patients undergoing treatment for the eating disorder # anorexia seemed to be responding positively to the antidepressant Prozac, medical researchers # conducted an experiment to investigate. They found 93 women being treated for anorexia who # volunteered to participate. For one year, 49 randomly selected patients were treated with # Prozac and the other 44 were given a placebo. At the end of the year, patients were diagnosed # as healthy or relapsed, as summarized in the following table:

# Diagnosis # Healthy Relapse Total # Treatment Prozac 35 14 49 # Placebo 32 12 44 # Total 67 26 93

# (a) Calculate the relative risk of relapsing on the placebo versus Prozac.

# (b) Interpret the relative risk in context.

# (c) Construct a 99% confidence interval for the relative risk.

# (d) Does the interval suggest a difference in risk of relapse between the drug and # placebo? Explain.