Suppose that in order to estimate of the average effect of participation in a job training program (train) on wage, you included controls for education (educ), years of experience (exper) in your model: log(wage) =  +

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A.  Exper is uncorrelated with train.
B.  Educ is likely correlated with both wage and train .
C. Educ and exper are highly correlated with each other.
D. There might be some other variable that is also correlated with both wage and train.


Answer: D

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