Given $Y = \beta_0 + \beta_1X + \beta_2Z + u$ and $E[u\mid X,Z] = 0$, what is $E[Y\mid X]$?
I've got $E[Y\mid X] = \beta_0 + \beta_1X + E[\beta_2Z\mid X]$. Can this be simplified further?
2026-03-25 12:46:16.1774442776
Find $E(Y\mid X)$ given the original relationship
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