a) The following table gives the aptitude test scores and productivity indices for a worker at a factory over a 10 week-period in Nairobi. Week Attitude score Productivity index 1 60 68 2 62 60 3 65 62 4 70 80 5 72 85 6 48 40 7 53 52 8 73 62 9 65 60 10 82 81 Formulate an Ordinary Linear Regression model stating clearly the independent and dependent variable, justifying your choices