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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Investigators concluded that human failure was not [#permalink]

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10 Nov 2009, 02:48
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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.

OA in a while
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10 Nov 2009, 04:10
D.

Since the number of reports have increased, mechanical problems may or may not have increased. Choice D is the right assumption. If airlines were more reluctant than earlier to report, then the increase in reports is not possible.
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10 Nov 2009, 04:15
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C

In short the arguments says: We have more stringent rules for identifying problems => problem reports increased by 50%.

But maybe the increase in reporting is not based on improved procedures? Maybe reason is the overall increase in number of problems?

Argument implies that the number of problems was the same and number of reports increased solely because of new rules. If this assumption does not hold then the argument is clearly faulty.

So for argument to be true the assumption (C) must hold.
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10 Nov 2009, 04:35
saorabh 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.

OA in a while

Conclusion is: reports of airplane mechanical problems have increased in frequency by 50 percent since last August.

Premise: new and more stringent rules for identifying and reporting mechanical problems have been in effect

We are looking for assumption which make conclusion clear.
A. out of scope
B. looks tempting for me (hold on)
C. tells nothing new - out
D. looks also out of scope
E. seems the best

Include E in logical scheme, and argument appears very nice.

Premise + Assumption = Conclusion
(Setting new rules for identifying reporting) + (By setting this rules, it becomes easier to detect mech problems) = The number of reports of mech problems has increased significantely.
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10 Nov 2009, 04:48
The arguments talks of increase in reported mechanical problems by 50 %. But all the reported mechanical problems may not be a mechanical problem. Some problems could be electronic or related to other areas but misinterpreted as a mechanical.

So Mechanical problems in airplanes should not increased by 50 percent

Hence IMO C
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10 Nov 2009, 04:50
Quote:

E is the general conclusion that could be made from argument, not the assumption
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10 Nov 2009, 05:17
Yup C it should be.
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10 Nov 2009, 05:21
saorabh 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.

OA in a while

My Choice is 'C'

Problems have not increased but the frequency of reports have increased.

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

This assumption supports the conclusion that human failure was not responsible for the fatal airplane crash last August.
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10 Nov 2009, 05:47
Seems like we'll need OE as well as OA...
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10 Nov 2009, 06:38
swatirpr wrote:
saorabh 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.

OA in a while

My Choice is 'C'

Problems have not increased but the frequency of reports have increased.

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

This assumption supports the conclusion that human failure was not responsible for the fatal airplane crash last August.

I think Investigator's conclusion is not the main.
I think the main conclusion is that setting new rules ACCOUNTS FOR increasing in reports.

But setting new rules dosn't merely mean that it becomes easier to detect the mech problem and therefore report about mech problem.

E seems the necessory assumption. Easier to detect --> more reports

(C) Mechanical problems in airplanes have not increased by 50 percent since last August.
I find no at all how C could help the argument.
C states that mech problems could 1) remain the same 2) decrease by any % 3)increase by 30% or 70% (not 50%)

Need OA...
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10 Nov 2009, 08:22
C it should be.

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10 Nov 2009, 12:03
"D" for me. "C" talks about 50 % increase in mechanical problems while the argument talks about 50% increase in reporting mechanical problems.I don't see direct connection between these two things.
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10 Nov 2009, 19:39
I would go for C

OA....?
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16 Nov 2009, 14:55
I think it is option C. The author believes that the recently reported problems already existed, but now they are being reported. These are pre-existing problems that, due to new regulations, have now been made official.

Oh, I can't wait for that OA!
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16 Nov 2009, 23:36
C.

"The new and more stringent rules for identifying and reporting mechanical problems have been in effect".
C says confirms this.
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17 Nov 2009, 00:26
It should be C.

The stem says that "That accounts for the fact that reports of airplane mechanical problems have increased in frequency by 50 percent since last August." . So, it assumes that it's the "new and more stringent rules for identifying and reporting mechanical problems" which is cause of 50% increase that we see and nothing else.

It falls into the category of "if A caused B, then "(assumed) nothing else was the cause of B""

what is OA
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18 Nov 2009, 08:58
I think it should be C.

E states that mechanical problems have become easier to identify. However, that's not an assumption that the statement makes. The new regulation for identifying and reporting mechanical problems could just have included more things that should be classified as mechanical problems then previously thought by pilots. The argument attributes the 50% increase of mechanical problems completely to the new regulation for detection. However, it's possible that there's an increase in the actual number of problems, so the answer should be c.
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04 Jan 2010, 19:29
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15 May 2011, 05:09
negating C clearly crashes the conclusion.

C
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15 May 2011, 10:17
saorabh wrote:
(C) Mechanical problems in airplanes have not increased by 50 percent since last August.

The author argues that the increase in mechanical problems report occurred because of the stringent rules regarding the reporting. However, it is perfectly possible that the increase in report occurred because of an actual increase in mechanical problems itself.

Ans: "C"
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