The Department of Transportation (DOT) fields thousands of complaints about airlines each year. The DOT categorizes and tallies complaints, and then periodically publishes rankings of airline performance. The following table presents the 2006 results for the 10 largest U.S. airlines. R-96

a. Which airline fielded the least amount of complaints?
Which airline fielded the most? Calculate the range.

b. Calculate the mean and median number of complaints from this sample.

c. Calculate the variance and standard deviation.

Transcribed Image Text:

Airline Complaints Airline Complaints 8.84 Southwest 1.82 Northwest Airlines Airlines JetBlue Airways 3.98 Delta Airlines 10.35 Alaska Airlines 5.24 American 10.87 Airlines AirTran Airways 6.24 US Airways 13.59 Continental 8.83 United Airlines 13.60 Airlines