Researchers at Purdue University and Wichita State University found that airlines aredoing a better job of getting passengers to their destinations on time (Associated Press,April 2, 2012). AirTran Airways and Southwest Airlines were among the leaders in ontime arrivals with both having 88% of their flights arriving on time. But for the 12% offlights that were delayed, how many minutes were these flights late? Sample data showing the number of minutes that delayed flights were late are provided in the file namedAirDelay. Data are shown for both airlines.a. Formulate the hypotheses that can be used to test for a difference between the populationmean minutes late for delayed flights by these two airlines.b. What is the sample mean number of minutes late for delayed flights for each of thesetwo airlines?c. Using a .05 level of significance, what is the p-value and what is your conclusion?

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Researchers at Purdue University and Wichita State University found that airlines are
doing a better job of getting passengers to their destinations on time (Associated Press,
April 2, 2012). AirTran Airways and Southwest Airlines were among the leaders in ontime arrivals with both having 88% of their flights arriving on time. But for the 12% of
flights that were delayed, how many minutes were these flights late? Sample data showing the number of minutes that delayed flights were late are provided in the file named
AirDelay. Data are shown for both airlines.
a. Formulate the hypotheses that can be used to test for a difference between the population
mean minutes late for delayed flights by these two airlines.
b. What is the sample mean number of minutes late for delayed flights for each of these
two airlines?
c. Using a .05 level of significance, what is the p-value and what is your conclusion?

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