Suppose n1=n2, find the number of samples needed to estimate (p1-p2) in each of the following cases: a. W=0.2, confidence level=99%, suppose p1=0.3, p2=0.6 b. B=0.05, confidence level=99%, suppose p1 and p2 are unknown c. B=0.05, confidence level=99%, suppose p1=0.1, p2=0.2

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