Refer to Exercise 12.16. Try using three explanatory variables Miles, TravDir, and DirEffct. What happens to TravDir in the presence of DirEffct? If you were scheduling a new 500-mile, west-bound flight, how much travel time would you allow for?
Exercise 12.16:
Refer to the analyses of the data set DELTAFLY in Section 12.7. What happens if you do a multiple regression with the explanatory variables Miles and TravDir (i.e., you don't adjust the direction effect for distance)?
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