Suppose the Transportation Security Administration is investigating procedures at the Atlanta airport to reduce the variability in the amount of time it takes passengers to get through airport security. The following table summarizes sample data collected from two different terminals employing different security procedures:

Terminal A Terminal B Sample standard deviation 8.4 minutes 9.7 minutes Sample size 15 13

a. Using a = 0.05, determine if the procedures at Terminal A more effectively reduce the variability than do the procedures at Terminal B.

b. Verify your results using PHStat.

c. Interpret the p-value obtained from the software.

AppendixLO1