Recall the data from the STAR study: Of the 9,726 women randomly assigned to use tamoxifen daily, 163 developed invasive breast cancer sometime during the next five years, compared to 168 in the group of 9,745 who were randomly assigned to use raloxifene daily.

a. Calculate the observed value of the relative risk of developing invasive breast cancer comparing women who took tamoxifen daily to those who took raloxifene daily.
b. Suppose that you were to calculate a 95% confidence interval for the long-run relative risk of developing invasive breast cancer comparing women who will take tamoxifen daily to those who will take raloxifene daily. Will the number 1 lie within this interval? Explain your reasoning.