QUESTION 2 The following summary statistics gives information on GPAs and starting salaries (rounded to the nearest hundred RM) of seven college graduates. Given that: Ex = 20.7 Zy=168 Ex- = 64.25 Zy' =4152 Exy = 514.5 i. Calculate the correlation coefficient ra. [4 marks] II. Comment on the relationship and the significance between this two variables [2 marks] Find the regression line for predicting y from x. [4 marks] iv. Predict the value of y if x =4. [2 marks] V. Suppose each of the value of x was multiplied by -3, what would be the value of the correlation coefficient between x and y? [1 mark] vi. Suppose each of the value of x and y were both increased by - 3, what would be the value of the correlation coefficient between x and y? [1 mark] vii. Suppose each of the value of a and y were both multiplied by -5. what would be the value of the correlation coefficient between x and y? [1 mark] [TOTAL: 15 MARKS]