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A government agency publishes ratings of airlines, ranking

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A government agency publishes ratings of airlines, ranking [#permalink] New post 30 Mar 2004, 09:02
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A government agency publishes ratings of airlines, ranking highest the airlines that have the smallest proportion of late flights. The agency┬б┬пs purpose is to establish an objective measure of the relative efficiency of different airlines' personnel in meeting published flight schedules.

Which one of the following, if true, would tend to invalidate use of the ratings for the agency's purpose?

(A) Travelers sometimes have no choice of airlines for a given trip at a given time.

(B) Flights are often made late by bad weather conditions that affect some airlines more that others.

(C) The flight schedules of all airlines allow extra time for flights that go into or out of very busy airports.

(D) Airline personnel are aware that the government agency is monitoring all airline flights for lateness.

(E) Flights are defined as 'late' only if they arrive more that fifteen minutes past their scheduled arrival time, and a record is made of how much alter than fifteen minutes they are.
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 [#permalink] New post 30 Mar 2004, 10:41
B looks fine to me.

The efficiency of personnel has no effect if the airline they operate is severly affected by the weather if those personnel are very efficient.
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 [#permalink] New post 30 Mar 2004, 11:10
B also. To add to Anandnk, B says that bad weather conditions affect some airlines more that others, thus rendering unfair the judgement layed upon affected airlines; personel will not be the cause of the delay and the "relative efficiency of different airlines' personnel" will be invalidated
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 [#permalink] New post 30 Mar 2004, 11:22
In that case, would choice validate the argument?
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 [#permalink] New post 30 Mar 2004, 11:36
aspire wrote:
In that case, would choice validate the argument?

I think there is a typo or an omission in your question :)
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 [#permalink] New post 30 Mar 2004, 11:49
The use of ratings is not for the public but for the agency's use. So what people choose has no bearing on the ratings unless more information about size of the airlines is given.
  [#permalink] 30 Mar 2004, 11:49
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