$\hat \beta$ - ?
A)cannot Be Calculated Since the Population Parameter Is

Multiple Choice

$\hat \beta$ - ?

A) cannot be calculated since the population parameter is unknown.
B) = ( $X ^ { \prime }$ X) ^-1 $X ^ { \prime }$ ^U.
C) = Y - $\hat { Y }$
D) = ? + ( $X ^ { \prime }$ X) ^-1 $X ^ { \prime }$ ^U