16. The data from exercise 2 follow.

xi 3 12 6 20 14 yi 55 40 55 10 15 The estimated regression equation for these data is  68 3x.

a. Compute SSE, SST, and SSR.

b. Compute the coefficient of determination r2

. Comment on the goodness of fit.

c. Compute the sample correlation coefficient.

17. The data from exercise 3 follow.

xi 2 6 9 13 20 yi 7 18 9 26 23 The estimated regression equation for these data is  7.6  .9x. What percentage of the total sum of squares can be accounted for by the estimated regression equation? What is the value of the sample correlation coefficient?