Recently airlines have cut services, such as meals and snacks during flights, and started charging extra for some services, such as accommodating overweight luggage, last-minute flight changes, and pets traveling in the cabin. However, they are still concerned about service. Recently, a group of four carriers hired Brunner Marketing Research Inc. to survey passengers regarding their level of satisfaction with a recent flight. The survey included questions on ticketing, boarding, in-flight service, baggage handling, pilot communication, and so forth. Twenty-five questions offered a range of possible answers: excellent, good, fair, or poor. A response of excellent was given a score of 4, good a 3, fair a 2, and poor a 1. These responses were then totaled, so the total score was an indication of the satisfaction with the flight. The greater the score, the higher the level of satisfaction with the service. The highest possible score was 100. Brunner randomly selected and surveyed passengers from the four airlines. Below is the sample information. Is there a difference in the mean satisfaction level among the four airlines? Use the .01 significance level. Northern WTA Pocono Branson 94 75 70 68 90 68 73 70 85 77 76 72 80 83 78 65   88 80 74   68 65       65

Recently airlines have cut services, such as meals and snacks during flights, and started charging
extra for some services, such as accommodating overweight luggage, last-minute flight changes, and pets
traveling in the cabin. However, they are still concerned about service. Recently, a group of four carriers hired
Brunner Marketing Research Inc. to survey passengers regarding their level of satisfaction with a recent flight.
The survey included questions on ticketing, boarding, in-flight service, baggage handling, pilot communication,
and so forth. Twenty-five questions offered a range of possible answers: excellent, good, fair, or poor. A
response of excellent was given a score of 4, good a 3, fair a 2, and poor a 1. These responses were then totaled,
so the total score was an indication of the satisfaction with the flight. The greater the score, the higher the level
of satisfaction with the service. The highest possible score was 100. Brunner randomly selected and surveyed
passengers from the four airlines. Below is the sample information. Is there a difference in the mean satisfaction
level among the four airlines? Use the .01 significance level.