Question 2 [15] A design matrix X, response vector Y and (X'X)-1 for a multiple linear regression are given as follows O 2 X = and 8 12 1 11 1 13 14 0.97476 0.24290 -0.22871\\ (xx) -1 = 0.24290 0.16207 -0.11120 -0.22871 -0.11120 0.08360 2.1 Determine: (1) X'X (ii) X'Y (iii) B (iv) Give the multiple regression equation for the data. 2.2 Estimate a 95% confidence interval for the intercept