■ Let X and Y be two random variables where Var (Y) = and their correlation is ρ. If E (Y|X) = a +

問題詳情

■ 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)__

【題組】(4)

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