In Simple Regression Analysis (Y = a + BX),the Estimate $\Sigma$

Multiple Choice

In simple regression analysis (Y = a + bX) ,the estimate of the slope coefficient b is equal to

A) [ $\Sigma$ [(X_i - X_mean) (Y_i - Y_mean) ] / $\Sigma$ (X_i - X_mean) ]².
B) $\Sigma$ {[(X_i - X_mean) (Y_i - Y_mean) ] / $\Sigma$ (X_i - X_mean) }².
C) $\Sigma$ [(X_i - X_mean) (Y_i - Y_mean) ] / $\Sigma$ (X_i - X_mean) ².
D) $\Sigma$ [(X_i + X_mean) (Y_i + Y_mean) ] / $\Sigma$ (X_i + X_mean) ².
E) $\Sigma$ [(X_i - X_mean) (Y_i - Y_mean) ] / $\Sigma$ (X_i - X_mean) .