Researchers at Purdew University and Wichita State University found that airlines are doing a better job of getting passengers to their destinations on time. AirTran 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 table below. Data are shown for both airlines.
AirTran | Southwest | AirTran | Southwest | AirTran | Southwest | AirTran | Southwest | AirTran | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
20 | 46 | 93 | 91 | 47 | 27 | 83 | 85 | 34 | ||||||||||||||||
4 | 89 | 61 | 101 | 16 | 77 | 114 | 28 | 16 | ||||||||||||||||
82 | 69 | 6 | 110 | 10 | 37 | 64 | 104 | 8 | ||||||||||||||||
54 | 38 | 31 | 87 | 66 | 78 | 85 | 102 | 61 | ||||||||||||||||
80 | 108 | 91 | 106 | 107 | 56 | 66 | 39 | 33 |
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.
μ1 = population mean minutes late for delayed AirTran flights
μ2 = population mean minutes late for delayed Southwest flights
H0 : μ1 - μ2 _________ 0
Ha : μ1 - μ2 _________ 0
b. What is the sample mean number of minutes late for delayed flights for each of these two airlines?
Airtran (to two decimals):
Southwest (to two decimals):
c. Using a .05 level of significance, what is the p-value and what is your conclusion? (Enter negative value as negative number)
t-value (to three decimals):
degrees of freedom (round degrees of freedom to previous whole number):
the p-value is _____ (lower than .01, between .01 and .02, between .02 and .05, between .05 and .10, between .10 and .20, between .20 and .40, greater than .40)
Hi Dear,
I have given my 100% to solve your problem.
So, please help me out by just thumbs up.
Thank you, so much
Get Answers For Free
Most questions answered within 1 hours.