Refer to Exercise 12.12. Fit a second- order regression model to the data.
a. Was there an improvement in the fit of the model compared to the first- order model?
b. Test the hypothesis that distance to the hub airport is a significant predictor of revenue at the α = .05 level.
c. Test the hypothesis that population size is a significant predictor of revenue at the α = .05 level.
In exercise

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