Question: Listed below are the costs in dollars of flights from

Listed below are the costs (in dollars) of flights from New York (JFK) to San Francisco for US Air, Virgin America, Delta, American, Continental, United, and Alaska. Use the sign test with a 0.05 significance level to test the claim that there is no difference in cost between flights scheduled 1 day in advance and those scheduled 30 days in advance. What appears to be a wise scheduling strategy?
Use a 0.05 significance level with the indicated test. If no particular test is specified, use the appropriate nonparametric test from this chapter.

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