Listed below are the costs (in dollars) of flights from New York (JFK) to San Francisco for US Air, Continental, Delta, United, American, Alaska, and Northwest. Use a 0.01 significance level to test the claim that flights scheduled one day in advance cost more than flights scheduled 30 days in advance. What strategy appears to be effective in saving money when flying?

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Flight scheduled 1 day in advance 456 614 628 1088 943 567 536 Flight scheduled 30 days in advance 244 20 264 264 278 318 280