Suppose an article included the accompanying data on airline quality score and a ranking based on the number of passenger complaints per 100,000 passengers boarded. In the complaint ranking, a rank of 1 is best, corresponding to fewest complaints. Similarly, for the quality score, lower scores correspond to higher quality. Airline Passenger Complaint Rank Airline Quality Score

Airtran 6 4
Alaska 2 3
American 8 8
Continental 7 6
Delta 12 7
Frontier 5 5
Hawaiian 3 Not rated
JetBlue 4 2
Northwest 9 Not rated
Southwest 1 1
United 11 10
US Airways 10 9

Two of the airlines did not have an airline quality score. Use the ranks for the other 10 airlines to fit a least-squares regression line. (Let x = passenger complaint rank and y = airline quality score.
ŷ = + x