Listed below are the costs (in dollars) of flights from New York (JFK) to Los Angeles (LAX). 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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Delta Jet Blue American Virgin Alaska United 501 148 642 313 633 1 day in advance 30 days in advance 634 646 633 149 156 156 252