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

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22 Mar 2005, 14:22
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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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22 Mar 2005, 14:34
I would go with (C).

If reporting increases by 50% and the problems have not increased by 50%, it means that more mechanical problems are now getting reported - which were earlier not getting reported. This forms the basis of their assertion that more stringent rules for identifying and reporting mechanical problems have bene in effect.
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22 Mar 2005, 14:42
C) !

negate C: Mechanical problems in airplanes HAVE increased by 50 percent since last August => conclusion falls apart. so C must be assumed.
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22 Mar 2005, 15:05
clearly "C"...cause-effect relationship.
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22 Mar 2005, 16:10
I'm confuse between 'C' and 'E'. I'll go with 'C' but still cannot negate 'E'

Can anyone explains why not 'E'
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22 Mar 2005, 16:27
OA is C.
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22 Mar 2005, 17:19
banerjeea_98 wrote:
clearly "C"...cause-effect relationship.

Baner: Please explain how it is C......I didnt understand.

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22 Mar 2005, 17:26
(E) is not true. We do not know if mechanical problems are easier to detect. All we know is that more problems are reported. They could still be hard to find.

(C) is the correct answer. If mechanical problems have not increased by 50%, then it must be the stringent rules that resulted in increased reports of mechanical failures.
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22 Mar 2005, 17:33
OA is C
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22 Mar 2005, 17:33
praveen_rao7 wrote:
Only C is stated in the passage

I wouldn't say C is stated in the passage, but is a condiition nescessary for the concluion to hold.
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22 Mar 2005, 17:37
My bad, I ment only C can be infered from the passage
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22 Mar 2005, 17:37
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# Investigators concluded that human failure was not

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