Question: Use the fact that E(Xij) = + ai + j with (ai = (j = 0 to show that E(Xi. - X..) = i,

Use the fact that E(Xij) = µ + ai + βj with (ai = (βj = 0 to show that E(X̅i. - X̅..) = αi, so that = X̅i. - X̅.. is an unbiased estimator for ai.

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