Isted below are the costs (in dollars) of flights between two cities for different airlines. 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? flight scheduled one day in advance 475 625 617 1078 933 557 547 flight scheduled 30 days in advance 240 257 253 272 292