A sales manager collected the following data on annual sales for new customer accounts and the number of years of experience for a sample of 10 salespersons. Salesperson Years of Annual Sales Experience ($1,000s) 1 80 2 3 97 3 4 92 4 4 102 6 103 8 111 10 119 8 10 123 11 117 10 13 136(b) Develop an estimated regression equation that can be used to predict annual sales (in $1,0005) given the years of experience. (c) Use the estimated regression equation to predict annual sales (in $1,0005) for a salesperson with 7 years of experience. $ 3' thousand