Researchers at Purdue University and Wichita State University found that airlines are doing a better job of getting pass

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Researchers At Purdue University And Wichita State University Found That Airlines Are Doing A Better Job Of Getting Pass 1 (70.88 KiB) Viewed 142 times

Researchers at Purdue University and Wichita State University found that airlines are doing a better job of getting passengers to their destinations on time. Airiran Airways and Southwest Airlines were among the leaders in on-time arrivals with both having 88% of their flights arriving on time. But for the 12% of flights that were delayed, how many minutes were these flights late? Sample data showing the number of minutes that delayed flights were late are provided in the file named AirDelay. Data are shown for both airlines. Assume population variances are unknown and unequal. Air Tran Southwest 34 59 433 30 3 45 64 42 33 66 32 42 48 105 45 28 38 85 110 50 10 26 70 75 45 33 50 63 52 83 78 27 70 42 35 33 64 65 27 90 38 52 76 (a) Formulate the hypotheses that can be used to test for a difference between the population mean minutes late for delayed flights by these two airlines. (Let uy = population mean minutes late for delayed Airtran flights and U2 = population mean minutes late for delayed Southwest flights.) o Ho: Mo - H230 Ha: M1 - uz > 0 Holly - H2 = 0 Hai 41 - H270 HO: Hly - 4270 Ho: M1 - M2 = 0 Ho! Hi - M2