A sales manager collected the following data on annual sales and years of experience. Salesperson Years of Experience Annual Sales ($1000s) 1 1 80 2 3 97 3 4 92 4 4 102 5 6 103 6 8 111 7 10 119 8 10 123 9 11 117 10 13 136 a. Develop an estimated regression equation that can be used to predict annual sales given the years of experience. (a1) Write down the steps and function you use to complete the approach