Question

Researchers at James 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 file named AirDelay. Data are shown for both airlines. Assume population variances are unknown and unequal.

AirTran

34	59	43	30	3
32	42	85	30	48
110	50	10	26	70
52	83	78	27	70
27	90	38	52	76

Southwest

45	64	42	33	66
105	45	28	38	85
75	45	33	50	63
42	35	33	64	65

(a)

What is the sample mean number of minutes late for delayed flights for each of these two airlines?

AirTran_______ min

Southwest_______ min

Calculate the test statistic. (Round your answer to three decimal places.)

__________.

What is the p-value? (Round your answer to four decimal places.)

p-value =___________.

Answer 1

a)

mean value of AirTran =50.60

mean value of Southwest =52.80

test statistic =-0.316

p value =0.7535 (please try 0.3768 if this comes wrong)