2. Prove That If The Conditional Distribution Of U; Conditional On T; Has Mean Zero, Then Cou(ui, Ii) = 0 In A Model Where Yi = Bo + B1 + Uj. (15 Points)

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2. Prove that if the conditional distribution of u; conditional on T; has mean zero, then Cou(ui, Ii) = 0 in a model where yi = Bo + B1 + Uj. (15 points)

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2. Prove That If The Conditional Distribution Of U; Conditional On T; Has Mean Zero, Then Cou(ui, Ii) = 0 In A Model Where Yi = Bo + B1 + Uj. (15 Points)

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