With rising fuel costs, the amount of time it takes for an airliner to taxi from

Question

With rising fuel costs, the amount of time it takes for an airliner to taxi from the departure gate to takeoff is a concern. Data File ATL Taxi times gives taxi times for random samples of 100 flights in July 2000 and in July 2007 at the Atlanta Hartsfield Airport. Construct a 95% confidence interval estimate of the mean taxi time at the Atlanta airport in July 2000. Construct a 95% confidence interval estimate of the mean taxi time at the Atlanta airport in July 2007. Based on your answers to parts a and b, can you conclude that taxi times increased between 2000 and 2007 at the Atlanta Airport?

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