Suppose that a case control study was conducted among women in the United States to find out if the use of vitamin D influenced the risk of developing colon cancer. Investigators selected 300 cases who were hospitalized for colon cancer and 900 controls. The study found that women in 40 cases and 300 controls had regularly taken vitamin D.

a. Set up the two-by-two table for these data. (2 points)

b. Calculate the answerusing the appropriate measure of association. (2 points)

c. Interpret your answer using (a) complete sentence(s). (1 point)