I do not have a clear understanding of how to answer the parts of this question below.

1. As a national manager for Southwest Airlines you have recently undertaken a survey of the number of passengers per flight on the Boston-Phoenix route that you service. The survey was conducted over five successive months. The data collected included the round-trip fare for an economy-class flight, the average annual per capita income of people who fly the Boston-Phoenix route, and the average passengers per flight on both Southwest and American. Assume that all other factors (the price charged by other airlines, the size of planes flown, etc.) have remained constant.