There is a remedy for male pattern baldness—at least that’s what millions of males hope since the FDA approved the compound minoxidil for this use. Minoxidil was investigated in a large, 27-center study in which patients were randomly assigned to receive topical minoxidil or an identical-appearing placebo. Ignoring the center-to-center variation, suppose the preliminary results were as follows:
| Sample Size | % With New Hair Growth |
Minoxidil group | 310 | 32 |
Placebo | 309 | 20 |
a. Use these data to test H0: π1 – π2 = 0 versus Ha: π1 – π2 ≠ 0 Give the p-value for your test.
b. If you were working for the FDA, what additional information might you want to examine in this study?
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