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The Global Business Travel Association reported the domestic airfare for business travel for the current year and the previous year (INC. Magazine, February 2012]. Below

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The Global Business Travel Association reported the domestic airfare for business travel for the current year and the previous year (INC. Magazine, February 2012]. Below is a sample of 12 flights with their domestic airfares shown for both years. Formulate the hypotheses and test for a significant increase in the mean domestic airfare for business Current Previous Ykar Year 345 315 526 463 420 462 216 206 285 275 405 432 635 585 710 650 605 545 517 547 570 508 610 580

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