Question

The success of an airline depends heavily on its ability to provide a pleasant customer experience. One dimension of customer service on which airlines compete is on-time arrival. The file LateFlights contains a sample of data from delayed flights showing the number of minutes each delayed flight was late for two different airlines, Delta and Southwest. Click on the datafile logo to reference the data. DATA file Delta Southwest Delta Southwest Delta Southwest Delta Southwest Delta 14 92 61 24 102 80 101 77 15 129 88 143 62 154 32 33 66 61 11 30 70 105 125 129 75 93 133 119 118 37 135 70 99 15 45 25 55 56 142 61 16 128 120 159 154 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. ?1 = population mean minutes late for delayed Delta flights ?2 = population mean minutes late for delayed Southwest flights H0 : ?1 - ?2 - Select your answer - 0 Ha : ?1 - ?2 - Select your answer - 0 b. What is the sample mean number of minutes late for delayed flights for each of these two airlines? Sample mean for Delta = (rounded to 2 decimals) Sample mean for Southwest = (rounded to 2 decimals) c. Using a 0.05 level of significance, what is the p-value and what is your conclusion? df = (rounded down to nearest whole number) p-value = (rounded to 4 decimals) We - Select your answer - reject H0.

          The success of an airline depends heavily on its ability to provide a pleasant customer experience. One dimension of customer service on which airlines compete is on-time arrival. The file LateFlights contains a sample of data from delayed flights showing the number of minutes each delayed flight was late for two different airlines, Delta and Southwest.

Click on the datafile logo to reference the data.

DATA file

Delta Southwest Delta Southwest Delta Southwest Delta Southwest Delta
14 92 61 24 102 80 101 77 15
129 88 143 62 154 32 33 66 61
11 30 70 105 125 129 75 93 133
119 118 37 135 70 99 15 45 25
55 56 142 61 16 128 120 159 154

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.

?1 = population mean minutes late for delayed Delta flights
?2 = population mean minutes late for delayed Southwest flights

H0 : ?1 - ?2 - Select your answer - 0
Ha : ?1 - ?2 - Select your answer - 0

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

Sample mean for Delta = (rounded to 2 decimals)
Sample mean for Southwest = (rounded to 2 decimals)

c. Using a 0.05 level of significance, what is the p-value and what is your conclusion?

df = (rounded down to nearest whole number)
p-value = (rounded to 4 decimals)

We - Select your answer - reject H0.

Added by Kristen B.

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