Question: Suppose that as a somewhat frustrated frequent flyer that often uses the Atlanta Hartsfield Airport, you feel that taxi times there are longer than at other comparable U.S. airports. According to the U.S. Bureau of Transportation Statistics, the average taxi out time at Large Hub Airports in the U.S. was 18.5 minutes in 2007. Data File ATL Taxi Times gives taxi out times for a random sample of 100 flights in July 2007 at the Atlanta Hartsfield Airport.

1. At the .05 level of significance, is there evidence that the mean taxi time at the Atlanta Airport in July 2007 was greater than 18.5 minutes?

   Complete the following:
   State H 0 .	\[\mu \le 18.5\]
   2. State H 1 .	\[\mu >18.5\]
   3. State the value of α.	0.05
   4. State the value of the test statistic.	T = 2.9278
   5. State the p-value.	p = 0.0021
   6. State the decision in terms of H 0 and why.	We reject Ho, because the p-value p = 0.0021 is less than alpha =0.05.
   7. State the decision in terms of the problem.	Based on the sample information, we have enough evidence to support the claim that the mean taxi times in July 2007 were greater than 18.5 minutes

2. Suppose you used a .01 level of significance. Would that change your decision in terms of the problem in part a? Explain why or why not.

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