■ Let X and Y be two random variables where Var (Y) = and their correlation is ρ. If E (Y|X) = a + bX where a and b are constants, then a =__(4)__ ,b=__(5)__， and E (Var (Y|X)] = __(6)__
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Var (Y) = 
and their correlation is ρ. If E (Y|X) = a + bX where a and b are constants,
then a =__(4)__ ,b=__(5)__， and E (Var (Y|X)] = __(6)__