A Visual Approach to SPSS for Windows 2nd Edition by Leonard Stern

Exercise 1

Note: Data files for these exercises are available at the publisher's website for this text, http://www.pearsonhighered.com/stern2e.
Each year, the Bureau of Transportation Statistics gathers data on various aspects of the U.S. airline industry's performance, including the incidence of mishandled baggage, that is, luggage reported as lost, damaged, delayed, or stolen. The data in file Airline.sav shows the rate of mishandled baggage per 1,000 passengers reported by U.S. airline companies over a three year period from 2004-2006. Use the data in this file to answer the following questions:
1. Has there been a significant change in the mean rate of mishandled baggage over the three-year period
2. Is there a significant linear trend in the mean rate of mishandled baggage over the three-year period