The drug Finasteride is marketed as Propecia to help protect against male pattern baldness, and it also may protect against prostate cancer. A large sampleof 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 95% confidence interval for the risk difference (proportion of subjects on Finasteride who develop cancer - proportion of subjects on placebo who develop cancer) is (-0.077, -0.043). Does this confidence interval provide evidence of an association between development of cancer and taking Finasteride? Briefly justify your response.
The drug Finasteride is marketed as Propecia to help protect against male pattern baldness, and it also may protect against prostate cancer. A large sampleof 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 95% confidence interval for the risk difference (proportion of subjects on Finasteride who develop cancer - proportion of subjects on placebo who develop cancer) is (-0.077, -0.043). Does this confidence interval provide evidence of an association between development of cancer and taking Finasteride? Briefly justify your response.
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