The brake horsepower developed by an automobile engine on a dynamometer is thought to be a function

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The brake horsepower developed by an automobile engine on a dynamometer is thought to be a function of the engine speed in revolutions per minute (rpm), the road octane number of the fuel, and the engine compression. An experiment is run in the laboratory and the data are drawn in Table 4E.10:
The brake horsepower developed by an automobile engine on 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?

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