Section 12.2.2 Practice
-The drug AZT is used to treat symptoms of AIDS. It was studied in an experiment involving volunteers already diagnosed as having HIV, the virus that causes AIDS. 435 subjects took AZT and another 435 took a placebo. At the end of the study, 17 of the AZT subjects had developed AIDS; 38 of the placebo subjects had developed AIDS. We want to test the claim that taking AZT lowers the proportion of people who go from HIV to AIDS.
The Practice of Statistics, First Edition.
Yates, Moore, McCabe