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a) Show that if X and Y are independent random variables, then Vαr(X - Y) = Vαr(X + Y)
b) Let D1 and D2 represent two draws at random with replacement from a population, with E(D1) = 10 and SD(D1) = 2. Find a number C. so that P(|D1 - D2 | c) > 99%
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