Given random variables y, x1, and x2, consider the model E(y|x1,x2)= β0+β1x1+β2x2+β3x22+β4x1x2
a. Find the partial effects of x1 and x2 on E(y|x1,x2)
b.Writing the equation as y=β0+β1x1+β2x2+β3x22+β4x1x2+u
what can be said about E(u|x1,x2)? What about E(u| x1, x2, x22,x1x2 )?
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