Selected Answers to Problem Set 6
1. To find the weighted averages, we should add the number of arrivals:
| Alaska Airline | America West | |||
|---|---|---|---|---|
| Destination | % on time | Total Flights | % on time | Total Flights |
| Los Angeles | 88.9 | 1370 | 85.6 | 1370 |
| Phoenix | 94.8 | 5488 | 92.1 | 5488 |
| San Diego | 91.4 | 680 | 85.5 | 680 |
| San Francisco | 83.1 | 1054 | 71.3 | 1054 |
| Seattle | 85.8 | 2408 | 76.7 | 2408 |
| Total | 90.8 | 11000 | 85.5 | 11000 |
4. We are looking for V such that BAV = AY. A is the matrix of the coefficients a
and b from the equation y=ax + b:
5. The same formula applies as in number 4.
7.
b.
c.
d.
8. Click here(pdf). I used log base 10; if you used log base e (ln) then your answers will be different. The line will be y = 0.665x + 1.094.