Refer to Exercise 12.12. In the plot of the data, airport 20 had a much larger revenue than any of the other 21 airports.
a. Replot the three scatterplots with the data from airport 20 deleted. Does there appear to be any relationship among revenue and the two explanatory variables in this data set?
b. Fit a first- order regression model relating revenue to distance and population size. Comment on the quality of the fit of the model to the data. Is revenue related to distance from hub and population size once airport 20 is deleted from the data?
c. What conclusions can be inferred from parts (a) and (b) about the importance of plotting the data and not just running models through a software program?
In exercise

Transcribed Image Text:

ula 96 96 73 55 91 64 60 60 220 70 75 005 014 193 250 250 220 170 170 250 140 22 17 724 67 38 43 33 24 $50 140 200 22 3 2 2 2 2 2 mpo 2 3 4 5. 8901 ala-56 74 67 78 73 54 00 98 kun 33 200 006 -39625534054 22221221112 125謚140 tes 24 368665330 rp- 1 2 3 4 5 6 7 8 9 0 1