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# The usefulness of lie detectors cannot be overestimated.

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The usefulness of lie detectors cannot be overestimated. [#permalink]

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12 Sep 2007, 23:11
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The usefulness of lie detectors cannot be overestimated. Although there is no employee screening procedure that is 100 percent accurate, the lie detector is a valuable tool for employers and employees alike. The lie detector’s usefulness is amply demonstrated in a recent survey conducted by a prestigious university. In the survey, those employees of a large company who were applying for a newly created position within the company were asked if they had ever worked on Project X. More than one-third of the applicants studied lied and said they had worked on the project—a project that never existed.

Which one of the following best identifies a flaw in the author’s argument about the usefulness of lie detectors?

(A) The argument depends on the assumption that whatever is good for the employer is good for the employee.
(B) Since lie detectors are known to be less than 100 percent accurate, the test will tend to help only those with something to hide.
(C) By referring to a prestigious university, the author is appealing to authority rather than to evidence.
(D) The study shows only that certain individual will lie, not that the lie detector can detect them.
(E) The author fails to address the issue that the use of lie detectors may fail to prevent embezzlement.
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Re: CR: Interesting story about lie detector [#permalink]

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13 Sep 2007, 00:32
Fistail wrote:
The usefulness of lie detectors cannot be overestimated. Although there is no employee screening procedure that is 100 percent accurate, the lie detector is a valuable tool for employers and employees alike. The lie detector’s usefulness is amply demonstrated in a recent survey conducted by a prestigious university. In the survey, those employees of a large company who were applying for a newly created position within the company were asked if they had ever worked on Project X. More than one-third of the applicants studied lied and said they had worked on the project—a project that never existed.

Which one of the following best identifies a flaw in the author’s argument about the usefulness of lie detectors?

(A) The argument depends on the assumption that whatever is good for the employer is good for the employee.
(B) Since lie detectors are known to be less than 100 percent accurate, the test will tend to help only those with something to hide.
(C) By referring to a prestigious university, the author is appealing to authority rather than to evidence.
(D) The study shows only that certain individual will lie, not that the lie detector can detect them.
(E) The author fails to address the issue that the use of lie detectors may fail to prevent embezzlement.

I think it is D
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13 Sep 2007, 00:40
I say D. C is the only other one that comes close, but it sounds like GMAT extremism and ventures too far from the argument.
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13 Sep 2007, 01:02
IMO, D
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13 Sep 2007, 01:30
Looks like D.

From what I understand, the piece isn't saying that the lie was detected by the lie detector. It was detected because the answer given could only possibly be a lie. So the claim tells us nothing about the effectiveness of lie detectors.
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Re: CR: Interesting story about lie detector [#permalink]

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13 Sep 2007, 03:16
Main conclusion of the argument is " The usefulness of lie detectors cannot be overestimated ", which depends on the sub-conclusion "the lie detector is a valuable tool for employers and employees alike". In turn, sub-conclusion is supported by the survey that acts as evidance/premise.
Survey only supports the conclusion to the extent that lie detectors are valuable for EMPLOYERS, while the argument mistakenly assumes that what is valuable for employers is also valuable for employees. there is no supporting information for this assumption.

A) correctly identifies the flaw in reasoning.

D) it seems to possibly identify the weakness/consfusion in the premise, but this is not the area that is tested in LR. I don't think we need to worry about validity, truthfulness or confusion in premise. it's same as spelling mistakes are not tested in SC.
In LR, I believe, logic behind the argument is tested. we gotta see whether infomation provided in the argument logically supports the conclusion? and, whether author makes reasonable assumptions ?

what is source of this question ?
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13 Sep 2007, 08:01
A for the same reason as above.
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Re: CR: Interesting story about lie detector [#permalink]

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13 Sep 2007, 08:17
OA is D.
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Re: CR: Interesting story about lie detector [#permalink]

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13 Sep 2007, 18:40
can you please tell the source ?
Re: CR: Interesting story about lie detector   [#permalink] 13 Sep 2007, 18:40
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# The usefulness of lie detectors cannot be overestimated.

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