In exercise 7 a sales manager collected the following data on x = annual sales and y 5 years of experience. The estimated regression equation for these data is y = 80 + 4x.

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 correlationcoefficient?

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Years of Experience Annual Sales ($1,000s) Salesperson 103 10 10 10 13