Consider the vehicle data from Consumer Reports in Figure
Chapter , Problem 7.85(choose chapter or problem)
Consider the vehicle data from Consumer Reports in Figure 7.24 on page 351. The data include weight (in tons), mileage (in miles per gallon), and drive ratio. A regression model was fitted relating weight x to mileage y. A partial SAS printout in Figure 7.24 shows some of the results of that regression analysis, and Figure 7.25 on page 352 gives a plot of the residuals and weight for each vehicle. (a) From the analysis and the residual plot, does it appear that an improved model might be found by using a transformation? Explain. (b) Fit the model by replacing weight with log weight. Comment on the results. (c) Fit a model by replacing mpg with gallons per 100 miles traveled, as mileage is often reported in other countries. Which of the three models is preferable? Explain.
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