4. A researcher follows 200 women who exercise regularly and 300 women who do not exercise regularly. After 30 years of follow-up, 20 of the women in the exercise group are diagnosed with osteoporosis while 30 women in the non-exercise group are diagnosed with osteoporosis.a. Draw the 2x2 contingency table showing the disease on top and the exposure on the side.b. Calculate the relative risk of developing osteoporosis between the two groups. (Show your work.)c. Calculate population attributable percent.