The question askes... to show E[Var (Y|X)] <= Var (Y)

I think we should apply the formula for E[Var(Y|X)] first...but I am stuck on it...

Anyone knows wha's the next step? Thanks.

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- October 4th 2009, 04:51 PMcm917variance question
The question askes... to show E[Var (Y|X)] <= Var (Y)

I think we should apply the formula for E[Var(Y|X)] first...but I am stuck on it...

Anyone knows wha's the next step? Thanks. - October 4th 2009, 06:18 PMChris L T521