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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Flight scheduled one day in advance 475 438 882 474 475 540 2909 Flight scheduled 30 days in advance 236 157 66 182 166 166 240