Question: Airline Fares

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 0.05 significance level to test the claim that there is no difference in cost between flights scheduled one day in advance and those scheduled 30 days in advance. What appears to be a wise scheduling strategy?

Flt scheduled 1 day in advance 456 614 628 1088 943 567 536

Flt scheduled 30 days in adv 244 260 264 264 278 318 280