Average late arrival times for Ellis Airlines and TravelAir are about the same, but the variation in late arrival times appears to be different. You have taken independent random samples of eight arrival times for the two airlines and compared actual arrival times to scheduled arrival times to calculate the late times. Results (in minutes late) are shown below.
a. Test the null hypothesis that the two populations represented here have equal variances. Assume that both population distributions are normal. Use a significance level of 10%.
b. Can you make the case from this sample data that TravelAir’s late arrival time variance is greater than Ellis’ late arrival time variance? Use a significance level of 5%.

  • CreatedJuly 16, 2015
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