Solve using R

Sales Experience and Sales Performance. In exercise 7 a sales manager collected the following data on x = annual sales and y = years of experience. The estimated regression equation for these data is y = 80 + 4x.

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. Compute SST, SSR, and SSE.

b. Compute the coefficient of determination r2. Comment on the goodness of fit.

c. What is the value of the sample correlation coefficient?