Multiple Regression Given the following information: Salesperson # of Sales # of Units Calls Sold 20 30 40 60 19 20 40 30 30 60 YOU AWN 10 30 10 40 23 20 40 20 50 9 20 30 10 30 70 to sell? If a salesperson makes 20 calls, how many how many units is she or he expected