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Suppose Y=1+X+0.5(![Suppose Y=1+X+0.5（[图]-1)+u, where X~N（0,1), u~N（0.](http://static.jiandati.com/88a9a92-chaoxing2016-708224.png)
-1)+u, where X~N(0,1), u~N(0,1), X and u are independent. (1) If the model is Y=1+X+ε, show that E(Xε)=0; (2) Calculate E(X|ε).
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