Exercise 5.3 Linear Regression and Correlation A real estate company conducts a survey of 15 of its agents. The table below shows the number of minutes spent with each costumer and the number of sales in a month. X 20 21 25 26 26 25 22 18 23 20 27 29 30 30 33 Y 8 10 12 15 11 10 10 9 11 11 12 14 14 15 18 X represents the number of minutes and Y represents the sales in a month. a) Find the equation of the regression line. b) Compute the correlation coefficient for the given data. c) Estimate the number of sales if the agent spent 45 minutes to each costumer