1 Why is multiple testing a problem?
20 hypotheses to test, and a signi cance level of 0.05. What’s the probability of observing at least one signi cant result just due to chance? P(at least one signi cant result) = 1 P(no signi cant results) = 1 (1 0:05)20 ˇ 0:64 So, with 20 tests being considered, we have a 64% chance of observing at least one sig- ................
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