Chapter 05.3 Exercise Question 13

5.3.13

Researchers Wilt et al. (New England Journal of Medicine, 2012) investigated whether surgery, compared to just observation, was (more) effective in improving men's survival chances after being diagnosed with prostate cancer. The researchers identified678men with localized prostate cancer and randomly assigned358to surgery and the remaining320to observation. All participants were followed for about 10 years. In those 10 years,20surgery recipients died of prostate cancer related reasons compared to28observation recipients.

Use an appropriate applet to find a theory-based p-value to test the your hypotheses. Report the standardized statistic as well as the p-value.

The p-value is_______________and the standardized statistic is_____________

.

Use an appropriate applet to find a theory-based 99% confidence interval and interpret the resulting interval in the context of the study.

We can be 99% confident that the probability of dying of prostate cancer for those that get surgery is between

________________lower and_____________higher than those that are just observed for 10 years.