Consider airline performance data for U.S. airlines were reported in the WSJ

Almanac (1999). Data (Airline) on the percentage of flights arriving on time and

the number of complaints per 100,000 passengers were as follows:

Airline % on Time Complaints

Southwest 81.8 0.21

Continental 76.6 0.58

Northwest 76.6 0.85

US Airways 75.7 0.68

United 73.8 0.74

American 72.2 0.93

Delta 71.2 0.72

America West 70.8 1.22

TWA 68.5 1.25

Compute for SSE