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. Define the parameters of interest. Assign symbols to these parameters.
b. Explain why it would be okay to use the theory-based method (that is, normal distribution based method) to find a confidence interval for this study.
c. Use an appropriate applet to find and report the theory-based 99% confidence interval.
d. Interpret the 99% confidence interval in the context of the study.
e. Relatively speaking, is the 99% confidence interval narrow or wide? Explain why that makes sense.