Queson3(5+4+2+5+4=20marks) The owner of a furniture store was attempting to analyse the relationship between advertising and sales and recorded the monthly advertising exPenses ($3013) and the sales (55m) for a sample of 12 months. The data are listed here. mm-m- Advertising 23 46 6t] 54 28 33 25 31 36 83 90 99 Sales 9.6 11.3 12.3 9.3 3-9 12-5 12.0 11.4 12.6 13.? 14.4 15.9 Required: a} Calculate the covariance of the two variables. b) Determine the coefcient of correlation. c) What do these statistics tell you about the relationship between advertising and sales? {1) Determine the least squares line. e) Determine the coefcient of determination. What do this tell you about the relationship between advertising and sales"