A sales manager for an advertising agency believes there is a relationship between the number of contacts that a salesperson makes and the amount of sales dollars earned). Compute the regression coefficients and develop the regression equation from the following data. sales earned $ 5.5 3.5 3.1 2.8 4.4 4.7 5.1 5.3 3.5 5.1 number of contacts 22 15 12 12 25 20 33 42 41 17