1. Prostate Cancer and a Drug for Baldness The drug finasteride is marketed as Propecia to help protect against male pattern baldness, and it also may protect against prostate cancer. A large sample of healthy men over age 55 were randomly assigned to receive either a daily finasteride pill or a placebo. The study lasted seven years and the men had annual check-ups and a biopsy at the end of the study. Prostate cancer was found in 804 of 4368 men taking finasteride and in 1145 of the 4692 men taking a placebo. a. Is this an experiment or an observational study? Explain. b. The study was double-blind; what does that mean? c. What are the two variables in the study? Are they categorical or quantitative? Explain. d. Make a two-way table to display the results. Include the row and column totals. e. What proportion of men in the study received finasteride? Use correct notation when reporting the answer. f. What proportion of men in the study got prostate cancer? Use correct notation. g. What proportion of men who took finasteride got prostate cancer? Use correct notation. h. What proportion of men who took the placebo got cancer? Use correct notation. i. Find the difference in the proportions of men who took the placebo and got cancer and men who took finasteride and got prostate cancer. Use correct notation. j. Does finasteride appear to offer some protection against prostate cancer?