Question 1 [4+4=8]: A linear regression model y = Bo+ Bizte was fit to 30 pairs of (y, x) observations, the x values ranging between 1.0 and 10.0. The least squares estimate of B1 was 0.81. Also, for these data RSS = 101.93; _x2 = 1155; Ex = 165. 1.1 Test the hypothesis Ho : B1 = 0.5 at the 5% level of significance. 1.2 Find the width of a 95% confidence interval for E(ylx = 3). Question 2 [21: Show that the least squares criterion applied to the "intercept-only" model