True or false, and explain. (a) In the regression model, E(Y|X) = X. (b) In the regression

True or false, and explain.

(a) In the regression model, E(Yˆ|X) = Xβˆ.

(b) In the regression model, E(Yˆ|X) = Xβ.

(c) In the regression model, E(Y |X) = Xβ.