Which of the Following Statements Are True?
A) the Denominator $\hat { \beta } _ { 1 }$

Which of the following statements are true?

A) The denominator of the slope $\hat { \beta } _ { 1 }$
Of the least squares line is $S _ { x x } = \Sigma \left( x _ { i } - \bar { x } \right) ^ { 2 }$
, which is a constant since it depends only on the $x _ { i } ^ { \prime } s$
And not on the $Y _ { i} ^ { \prime } s$
B) The slope $\hat { \beta } _ { 1 }$
Of the least squares line is a linear function of the "independent" random variables $Y _ { 1 } Y _ { 2 } \ldots \ldots , Y _ { n }$
Each of which is normally distributed.
C) The distribution of the slope $\hat { \beta } _ { 1 }$
Of the least squares line is always centered at the value of the slope $\beta _ { 1 }$
Of the population regression line.
D) All of the above statements are true.
E) None of the above statements are true.