2 4. The age and annual salary of a random sample of 20 University graduates in a town is shown below. Person N 3 4 5 6 7 8 9 10 Age in years 23 61 47 21 23 31 42 24 29 59 Salary $1000s 52 45 43 58 62 56 65 43 85 72 Person 11 12 13 14 15 16 17 18 19 20 Age in years 40 25 23 25 29 21 22 27 26 42 Salary $1000s 61 55 35 42 60 34 18 39 57 10 (a) Draw a scatter plot to display the relationship between age and annual salary. (b) Insert an estimated line of best fit on the scatter plot and determine the/equation of this line. You may use your calculator to find the exact line of best fit or you can use your graph line. (c) Looking at the scatter plot what do you think the relationship is between age and salary? Remember to justify your answer. (7 marks) O W