The average cost per passenger along each
route is given by ci :
a b c
1. Seattle-Portland 980 3.1 810
2. Seattle-Spokane 1210 1.4 335
3. Seattle-SanFrancisco 1560 2.2 608
4. Portland-Spokane 750 2.8 428
5. Portland-SanFrancisco 850 1.2 720
6. Spokane-SanFrancisco 890 0.9 250
The profit along route i (represented by πi) is found with this formula:
πi=aiQi−biQi2−ciQi
What is the slope of the regression line (where the X range is TIME, and the Y range is the logarithm of GDP)? (The slope is the coefficient of TIME in the regression results.)
