In tests for pironoma, a serious disease, a false positive : GMAT Critical Reasoning (CR)
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# In tests for pironoma, a serious disease, a false positive

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Manager
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In tests for pironoma, a serious disease, a false positive [#permalink]

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13 Mar 2011, 18:53
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In tests for pironoma, a serious disease, a false positive result indicates that people have pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma when, in fact, they do. To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results.
Which of the following, if true, gives the most support to the recommendation above?
(A) The accepted treatment for pironoma does not have damaging side effects.
(B) The laboratory test that has the lowest proportion of false positive results causes the same minor side effects as do the other laboratory tests used to detect pironoma.
(C) In treating pironoma patients, it is essential to begin treatment as early as possible, since even a week of delay can result in loss of life.
(D) The proportion of inconclusive test results is equal for all laboratory tests used to detect pironoma.
(E) All laboratory tests to detect pironoma have the same proportion of false negative results.
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Re: lab test to detect pironoma, a serious disease [#permalink]

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13 Mar 2011, 19:37
To make the argument predictable, when one thing varies the other variable should be constant. This is simple quant which makes E as the answer.

fanatico wrote:
In tests for pironoma, a serious disease, a false positive result indicates that people have pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma when, in fact, they do. To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results.
Which of the following, if true, gives the most support to the recommendation above?
(A) The accepted treatment for pironoma does not have damaging side effects.
(B) The laboratory test that has the lowest proportion of false positive results causes the same minor side effects as do the other laboratory tests used to detect pironoma.
(C) In treating pironoma patients, it is essential to begin treatment as early as possible, since even a week of delay can result in loss of life.
(D) The proportion of inconclusive test results is equal for all laboratory tests used to detect pironoma.
(E) All laboratory tests to detect pironoma have the same proportion of false negative results.
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Re: lab test to detect pironoma, a serious disease [#permalink]

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13 Mar 2011, 20:08
A will be option if the recomm was to use the test with least proportion of false negative
B discusses side effects of various tests- irrelevant
C mentions timings- but no mention is in question of timelines of the tese.
D talks of all incolclusive tests- not only the false positive ones
E says all other things being equal ( all tests having the same proportion of false negative results) which should be used- obviously, the one wth least false positive.
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Re: lab test to detect pironoma, a serious disease [#permalink]

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14 Mar 2011, 00:13
fanatico wrote:
In tests for pironoma, a serious disease, a false positive result indicates that people have pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma when, in fact, they do. To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results.
Which of the following, if true, gives the most support to the recommendation above?
(A) The accepted treatment for pironoma does not have damaging side effects.
(B) The laboratory test that has the lowest proportion of false positive results causes the same minor side effects as do the other laboratory tests used to detect pironoma.
(C) In treating pironoma patients, it is essential to begin treatment as early as possible, since even a week of delay can result in loss of life.
(D) The proportion of inconclusive test results is equal for all laboratory tests used to detect pironoma.
(E) All laboratory tests to detect pironoma have the same proportion of false negative results.

The gist of the matter is that people should not be unduly scared about having contracted pironoma disease.The impression is that people should not be led to believe that they dont have pironoma when in fact they do.
This can be explained by the fact that a false negative is not a problem but a false positive is.
One feasible explanation is that all tests have the same false negative where as the false positive is a parameter that can be considered
A : Mildly Strengthens but not in context

B : Irrelevant
C:Weakens
D:Weakens
E :Strengthens
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Re: In tests for pironoma, a serious disease, a false positive [#permalink]

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19 May 2013, 05:20
False +ve => Detected when they don't have
False -ve => Not Detected when they have

False -ve is disastrous without any assumptions.Because if a person has a disease and it goes undetected it is disastrous.Furthermore, had it been mentioned that due to false +ve patients will be diagnosed and there will be side effects of the diagnosis then False +ve would have been most important.

However, here in this case when False -ve has not been given importance in the stimulus and False +ve is given important criterion.

Then recommendation for laboratory tests falls on the more number of False -ve detected.So (E) implies that proportion is constant thereby is the best answer choice !

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Re: In tests for pironoma, a serious disease, a false positive [#permalink]

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22 Nov 2014, 05:36
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: In tests for pironoma, a serious disease, a false positive   [#permalink] 22 Nov 2014, 05:36
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