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The drug AZT was the first effective treatment for AIDS. An important medical experiment
demonstrated that regular doses of AZT delay the onset of symptoms in people whom
HIV is present. The researchers who carried out this experiment wanted to know the following:

* Does taking either 500 mg of AZT or 1500 mg of AZT per day delay the development
of AIDS?

* Is there any difference between the effects of taking these two doses?

The subjects were 1200 volunteers already infected with HIV but with no symptoms of AIDS
when the study started.

a) Outline the design of the experiment

b) Describe briefly how you would use a table of random digits to do the randomization required
by design. Then use Table B beginning at line 113 to choose the first five subjects for one of
your groups.

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