You have fit a multiple linear regression model and the (X'X) 1 matrix is: (a) How many regressor variables are in this model? (b) If

You have fit a multiple linear regression model and the (X'X)^ˆ’1matrix is:

(a) How many regressor variables are in this model?

(b) If the error sum of squares is 307 and there are 15 observations, what is the estimate of σ²?

(c) What is the standard error of the regression coefficient β₁?

0.893758 -0.0282448 -0.0175641 (X'X) =|-0.028245 0.0013329 0.0001547 0.0001547 0.0009108 %3D |-0.017564