In the beginning of a study 200 of 500 men lived within a 1 -mile radius of a nuclear power plant. Of those 200,10 had prostate cancer at baseline.
Those who lived outside of the 1 -mile radius were cancer free at the beginning of the study.
Over the next 10 years, of those who lived within 1 -mile, 19 developed prostate cancer. Of those who were outside the 1 -mile radius. 10 developed prostate cancer.
From this sampte, what is the relative rid (RR) of developing prostate cancer if you lived outside one-mile radius of the nuclear power compared to those who were inside the one-mile radius among males? Note the order of the comparison, >1-mile vs. <1,mile.