1.1 Consider Y₁, Y2,...,Yn are i.i.d. random variables with n > 4 and T is the sample mean Y. Also let W = 1 Y₁. Then (A) E(Y₁+Y₂|W) = E(Y₁+Y₂) (B) E(W|T) = E(Y₁|T) (C) E(Y₁+W|W) = E(Y3+Y4|W) (D) none of the above.

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