13.11 University Textbooks II Refer to Exercise 13.10.

a. Use the values of SSR and Total SS to calculate R. Compare this value with the value given in the printout.

b. Calculate R(adj). When would it be appropriate to use this value rather than R to assess the fit of the model?

c. The value of R(adj) was 95.7% when a simple linear model was fit to the data. Does the linear or the quadratic model fit better?