A large international sales organization has collected data on the number of sales employees and the annual gross sales during the last 13 years. # of sales employees sales (in $000,000s) 1000 122 1010 133 1050 134 1025 121 1030 140 1038 150 1070 155 1100 159 1180 164 1320 184 1246 178 1250 ? a) Estimate the regression line to show how gross sales depend on the number of employees; that is, find the estimated equation and also (attach your output) b) Interpret the estimated coefficients. c) Determine the predicted value of sales for 1250 employees