b. Do you think the linear model is appropriate? Explain.

c. If she uses this model to try to predict the diameter of a 50-year old maple tree, would you expect that estimate to be fairly accurate, too low, or too high? Explain.

Now she re-expresses the data, using the logarithm of age to try to predict the diameter of the tree. Here are the regression analysis and the residuals plot.

d. Explain why you think this is a better model.

e. Using this model, predict the diameter of a maple tree at age 50 years.