Suppose the Federal Aviation Administration would like to compare the on-time performances of different airlines on domestic, nonstop flights. The following table shows three different airlines and the frequency of flights that arrived early, on time, and late for each:

Status Southwest United Airlines Delta Early 20 24 22 On time 60 55 50 Late 25 30 14

a. Using a = 0.05, perform a chi-square test to determine if on-time performance and airline are independent of one another.

b. What conclusions can be made based on your results?

c. Determine the p-value using Excel and interpret its meaning.

d. Verify your results using PHStat.

AppendixLO1