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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09 May 2009, 10:42
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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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Re: CR: airplane mechanical problems [#permalink]

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09 May 2009, 16:07
IMO C

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 --> this is not about the result of increase mechanical reports, but about the cause of them
(B) Mechanical problems in airplanes have increased dramatically since last August -->weaken. More mechanical problems-->more reports (not because of more rules)
(C) Mechanical problems in airplanes have not increased by 50 percent since last August -->negating this: Mechanical problems in airplanes have increased by 50 percent since last August -->weaken like (B). So, the best
(D) Airlines are less reluctant to report mechanical problems than they previously were -->weaken. Because airlines are now likely to report mechanical problems than they were before, this accounts for the fact that mechanical reports increase (not because of more rules)
(E) Mechanical problems in airplanes have become easier to detect since last August -->another weaken. Analyzing like (B) & (D)
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Re: CR: airplane mechanical problems [#permalink]

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09 May 2009, 17:16
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.

Anwser: C
It says "Mechanical problems in airplanes have not increased by 50 percent since last August."..The conclusion is the reports were increased by 50% which means already existing problems were reported rather than new problems.
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Re: CR: airplane mechanical problems [#permalink]

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08 Jun 2009, 10:53
I'm with C as well.
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Re: CR: airplane mechanical problems [#permalink]

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14 Jun 2009, 10:43
Its C for me...If the reason is not human error then it should be mechanical problem...To make it true, the amount of mechanical problems today should not be much more than that present earlier...C brings it out clearly...
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Re: CR: airplane mechanical problems [#permalink]

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14 Jun 2009, 10:52
Agree with C
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Re: CR: airplane mechanical problems [#permalink]

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06 May 2010, 14:00
C seems to be right
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Re: CR: airplane mechanical problems [#permalink]

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06 May 2010, 14:21
IMO it should be D..Pls post the OA..
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Re: CR: airplane mechanical problems [#permalink]

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06 May 2010, 14:29
IEsailor wrote:
IMO it should be D..Pls post the OA..

Its C only,

D states that now airline are more eager to report => increase in the reports is because of their eagerness not because of the rules.
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Re: Investigators concluded that human failure was not [#permalink]

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27 Aug 2015, 00:08
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Re: Investigators concluded that human failure was not [#permalink]

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27 Aug 2015, 11:08
Ans is C
Premise :50% increase in reporting airplane mechanical problems
conc: Human failure not responsible
Assp:Mechanical problems in airplanes have not increased by 50 percent since last August
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Re: Investigators concluded that human failure was not [#permalink]

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11 Sep 2015, 11:02
Can some one explain how can it be 'C' ? , I felt confused at 'if reports were increased by 50%, how can we conclude that those 50% reports doesn't constitute to 50% of mechanical problems ?'. Here I assume 50% mechanical problems as the problems that are newly raised. Thankyou
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Re: Investigators concluded that human failure was not [#permalink]

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12 Sep 2015, 02:45
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satyaachanta wrote:
Can some one explain how can it be 'C' ? , I felt confused at 'if reports were increased by 50%, how can we conclude that those 50% reports doesn't constitute to 50% of mechanical problems ?'. Here I assume 50% mechanical problems as the problems that are newly raised. Thankyou

Hi
I am not expert, but expert can comment on my reasoning

Because of stringent rules for identifying and reporting mechanical problems are in effect, reports of airplane mechanical problems have increased in frequency by 50 percent since last August.
Eg. before stringent rules mechanical problems reported were 50 , but actually there were 75 problems. So 25 were not reported.
After stringent rules, mechanical problems reported are 75 and in reality also 75 problems are there.
This means reports of airplane mechanical problems increased in frequency by 50 percent but actual problems have not increased. this is choice C which supports that only report frequency has increased , not actual problems count are same.

This assumption is needed because author specifically says --- more stringent rules for identifying and reporting mechanical probbeen ilems have n effect. That accounts for the fact that reports -----
If actual problems itself are increasing then we cant attribute increase in reporting to stringent rules.
We have to show, problems are all same only more stringent rules have helped to identify the problem.
Re: Investigators concluded that human failure was not   [#permalink] 12 Sep 2015, 02:45
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