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Show that Cov( X, Y)| 0. Expand the left-hand side with Theorem 5.4(b). Then substitute a = Cov( X, Y ) and b = Var

Show that Cov( X, Y)| 0. Expand the left-hand side with Theorem 5.4(b). Then substitute a = Cov( X, Y ) and b = Var (X)

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