Investigators concluded that human failure was not : GMAT Critical Reasoning (CR)
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# Investigators concluded that human failure was not

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Manager
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Investigators concluded that human failure was not [#permalink]

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05 May 2005, 23:38
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Investigators concluded that human failure was not responsible for the fatal airplane crash last August, and since that time new and more stringent rules for identifying and reporting mechanical problems have been in effect. That accounts for the fact that reports of airplane mechanical problems have increased in frequency by 50 percent since last August.

Which one of the following is an assumption underlying the argument in the passage?

(A) Airplane travel is still relatively safe, despite the increase in reported mechanical problems.

(B) Mechanical problems in airplanes have increased dramatically since last August.

(C) Mechanical problems in airplanes have not increased by 50 percent since last August.

(D) Airlines are less reluctant to report mechanical problems than they previously were.

(E) Mechanical problems in airplanes have become easier to detect since last August
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05 May 2005, 23:47
C)...if "Mechanical problems in airplanes HAVE increased by 50 percent since last August" then he cannot conclude that more stringent report are responsible for the increase. so negate C) and his conclusion falls apart.
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06 May 2005, 00:13
dipaksingh wrote:
how to refute D

negate D)..."Airlines are NOT less reluctant to report mechanical problems than they previously were" that means they are more reluctant to report the problems. then the conclusion of the author is right. he can logicially assume that although the airlines are less reluctant the rate of problems increased. so the only fair conclusion is that the new measure are responsible for the increase.
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06 May 2005, 00:46
Yes, it should be C. Initially even I was tempted to pick D though.
06 May 2005, 00:46
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