(a) Show that Cov(X, Y) Cov(X, E[Y|X]) (b) Suppose, that, for constants a and b, Show that...

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(a) Show that Cov(X, Y) Cov(X, E[Y|X])

(b) Suppose, that, for constants a and

b, Show that E[Y\X] = a + bx = b Cov(X, Y)/Var(X)

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