From the formula on page 84, the standard deviation of a discrete probability distribution is (a) When

 From the formula on page 84, the standard deviation of a discrete probability distribution is

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(a) When y can equal only 0 and 1, letting = P(y = 1) and 1 = P(y = 0), show that = and that - = (1-). (b) Show that the standard error of a sample proportion for a random sample of size n equals (1-)/n.