91. Airfares. In recent years, the airline industry has been severely criticized for a variety of service-related issues including poor on-time performance, canceled flights, and lost luggage. Some believe airline service is declining while the price of airline fares is increasing. A sample of 10 third quarter changes in airfares is shown below.

a) Does the percent change in airfare from the third quarter 2006 column represent paired data? Why or why not?

b) Was there an actual change, on average, in airline fares between the two quarters? Perform the test on both the actual and percentage differences. Discuss the results of the test and explain how you chose between the fares and the percent differences as the data to test.

Transcribed Image Text:

Origin Percent Third Quarter Third Quarter Change from 2006 2007 3rd Qtr 2006 Cincinnati, OH 511.11 575.67 12.6 Salt Lake City, UT 319.29 344.48 7.9 Dallas Love, TX 185.12 198.74 7.4 New York JFK, NY 324.75 345.97 6.5 Hartford, CT 341.05 363.17 6.5 Charleston, SC 475.10 367.08 -22.7 Columbus, OH 322.60 277.24 -14.1 Kona, HI 206.50 180.40 -12.6 Memphis, TN 418.70 382.29 -8.7 Greensboro/ 411.95 377.41 -8.4 High Point, NC