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6. Suppose we want to conduct a hypothesis test to determine if there was a significant difference in U.S. air fares between the fourth quarter of 2006 and the fourth quarter of 2007. Data File Air Fares gives the average air fares at the 100 largest U.S. markets in the fourth quarter of 2007 and in the fourth quarter of 2006. a. Would it be appropriate to use this data for the hypothesis test mentioned? Explain why or why not. b. What would be a better data collection method for the hypothesis test in part a.

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