Question 4 (30 marks] Dr Jing Tian investigated some of the factors that affect an individual student's final grade in his or her course. She proposed the multiple regression model: 1=B + Ax, + Bix , + Bix, +6 Where: y = final mark (out of 100). x - number of lectures skipped. x, " number of late assignments x, - mid-term test mark (out of 100). The Lecturer recorded the data for 50 randomly selected students. The regression output is shown below. THE REGRESSION EQUATION IS