We want to estimate the treatment effect of D ony via a linear regression model y = bo+b1x +rD+u.where x is an exogenous controi variable. If the value of the treatment variable Dis randomly assigned. there O a. the OLS estimate of ris biased due to sampie selection. Ob.the OLS estimate ofris unbiased. Octhe error u is homoskedastic. O d. the OLS estimator is BLUE.

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