The conditional variance of X, given Y, is defined by Var(XY) E[(X - E[XY])|Y] Prove the conditional
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The conditional variance of X, given Y, is defined by Var(XY) E[(X - E[XY])|Y] Prove the conditional variance formula, namely, Var(X) E[Var(X|Y)] + Var(E[X|Y]). Use this to obtain Var(X) in Example 1 5(B) and check your result by differentiating the generating function
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