The Normal Approximation to the Sampling Distribution Of $\widehat { \beta } _ { 1 }$

Multiple Choice

The normal approximation to the sampling distribution of $\widehat { \beta } _ { 1 }$ is powerful because

A) many explanatory variables in real life are normally distributed.
B) it allows econometricians to develop methods for statistical inference.
C) many other distributions are not symmetric.
D) is implies that OLS is the BLUE estimator for $\beta _ { 1 }$