Commercial airlines overbook flights, selling more tickets than they have seats, because a sizeable number of reservation holders don’t show up in time for their flights. But sometimes, there are more passengers wishing to board than there are seats. Most airlines try to entice travelers to voluntarily give up their seats in return for free travel or other awards, but they do have to “bump” some travelers involuntarily. Of course, they don’t like to offend passengers by bumping, so they are constantly trying to improve their systems for predicting how many passengers will show up. Have the rates of “bumping” changed? Here are data on the number of passengers involuntarily denied boarding (“bumping” is not the approved term) per 10,000 passengers during the periods of January to June in 2011 and 2012 by airline.
a) Are these paired data? Why or why not?
b) Was there a statistically significant change in the number of passengers involuntarily denied boarding per 10,000 passengers?

  • CreatedMay 15, 2015
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