Consider the following GRETL script: nulldata 300 loop j=1..10000 progressive genr x1=normal(0,1) genr x2=0.1*x1+0.9*normal(0,1) genr u=normal(0,2) genr y=8+1*x1+2*x2+u ols y 0 x1 x2 genr b1hat=$coe(x1) store mc1.gdt b1hat endloop (a) (0.25 points) How many estimations of β2 are obtained in the script? (b) (0.25 points) What is the average value of the estimations of β2? (c) (0.5 points) By replacing the 4th line with the following genrx2 = 0.5 ∗ x1 + 0.5 ∗ normal(0, 1), what happens to the VIF of β2?