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Investigators concluded that human failure was not

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Investigators concluded that human failure was not [#permalink] New post 06 Jun 2008, 07:14
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E

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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-Investigators [#permalink] New post 06 Jun 2008, 07:31
Expert's post
C

...since that time new and more stringent rules.... 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.

Assumption: There was no other reason why the reports have increased since last August.

(C) Mechanical problems in airplanes have not increased by 50 percent since last August.
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Re: CR-Investigators [#permalink] New post 06 Jun 2008, 07:40
C for me too..!!!
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Re: CR-Investigators [#permalink] New post 06 Jun 2008, 08:13
goalsnr wrote:
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


C here as well.

If we negate the assumption in C, it means that mechanical problems have increased by 50% and this kills the argument since the argument is built on the premise that the new and stringent rules and regulations are responsible for the increaed reports nit the actual cases.
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Re: CR-Investigators [#permalink] New post 06 Jun 2008, 10:28
C for me as well. Without C, you cannot safely reach the conclusion that the increase in reports is due to more stringent reporting requirements
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Re: CR-Investigators [#permalink] New post 07 Jun 2008, 18:06
OA Please
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Re: CR-Investigators [#permalink] New post 08 Jun 2008, 14:19
Another C!

OA??
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Re: CR-Investigators [#permalink] New post 09 Jun 2008, 15:32
OA is C
Re: CR-Investigators   [#permalink] 09 Jun 2008, 15:32
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Investigators concluded that human failure was not

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