12.38 Professor Asimov, again Refer to Exercise 12.9, in which the number of books x written by Isaac Asimov are related to the number of months y he took to write them. A plot of the data is shown.

a. Can you see any pattern other than a linear relationship in the original plot?

b. The value of r for these data is 0.959. What does this tell you about the fit of the regression line?

c. Look at the accompanying diagnostic plots for these data. Do you see any pattern in the residuals? Does this suggest that the relationship between number of months and number of books written is something other than linear?

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95- 90- 80- 70- 60 50- 40 30- 20- 10- Percent -50 Residual -10- 20- 10- Residuals versus the Fitted Values (response is y) 250 300 350 400 450 500 550 Fitted Value Normal Probability Plot of the Residuals (response is y) 0 Residual 25 50