Question: 6. Use the second mean plus error expression of the response variable given in (4.6.6) and Proposition 4.4-2 to derive the formula E(Y) = 0.
6. Use the second mean plus error expression of the response variable given in (4.6.6) and Proposition 4.4-2 to derive the formula E(Y) = β0. (Hint. Recall that any
(intrinsic) error variable has mean value zero.)
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