Concept explainers
Analyze the residuals from the regression model in Exercise 4.47. Comment on model adequacy.
4.47. The brake horsepower developed by an automobile engine on a dynamometer is thought to be a
- (a) Fit a multiple regression model to these data.
- (b) Test for significance of regression. What conclusions can you draw?
- (c) Based on t-tests, do you need all three regressor variables in the model?
TABLE 4E.10
Automobile Engine Data for Exercise 4.47
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