Before lead poisoning starts to cause serious damage, it can : GMAT Critical Reasoning (CR)
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# Before lead poisoning starts to cause serious damage, it can

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10 Jul 2011, 20:51
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Before lead poisoning starts to cause serious damage, it can be detected through a screening test. Every test sometimes produces false positives, indicating that the people tested have lead poisoning, when, in fact, they do not; a false negative indicates that people do not have lead poisoning when, in fact, they do. To detect lead poisoning most accurately, medical workers should use the screening test which has the lowest proportion of false negative results.

Which of the following, if true, most strongly supports the above recommendation?

The test with the lowest false negative rate also requires the most time-intensive laboratory procedures.
All screening tests used to detect lead poisoning have the same proportion of false positive results.
The proportion of inconclusive test results is equal for all screening tests used to detect lead poisoning.
The screening test which has the lowest proportion of false negative results causes side effects less frequently than other tests.
The treatment for lead poisoning, called chelation therapy, sometimes has serious side effects.

[Reveal] Spoiler: OA

Last edited by agdimple333 on 12 Jul 2011, 06:47, edited 1 time in total.
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10 Jul 2011, 21:00
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agdimple333 wrote:
Before lead poisoning starts to cause serious damage, it can be detected through a screening test. Every test sometimes produces false positives, indicating that the people tested have lead poisoning, when, in fact, they do not; a false negative indicates that people do not have lead poisoning when, in fact, they do. To detect lead poisoning most accurately, medical workers should use the screening test which has the lowest proportion of false negative results.

Which of the following, if true, most strongly supports the above recommendation?

The test with the lowest false negative rate also requires the most time-intensive laboratory procedures.
All screening tests used to detect lead poisoning have the same proportion of false positive results.
The proportion of inconclusive test results is equal for all screening tests used to detect lead poisoning.
The screening test which has the lowest proportion of false negative results causes side effects less frequently than other tests.
The treatment for lead poisoning, called chelation therapy, sometimes has serious side effects.

I think its B
If all tests have the same proportion of false postives.. then obviously the one with lower proportion of false negative will be better.

ex: Test A = 100 cases - 20% = 20 are false postive , and 30 are false negative
test B = 100 test - 20% = 20 are false postive, and only 10 are false negative.....( as given in the question)

obviously B will be accurate... For sure a little tricky to decipher.
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10 Jul 2011, 21:14
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The test with the lowest false negative rate also requires the most time-intensive laboratory procedures.- this is highlighting a supposed negative of the tests which the argument is reporting - the lowest false negative tests take a lot of time to give results..that cannot support the recommendation, if anything, it will weaken it
All screening tests used to detect lead poisoning have the same proportion of false positive results. Correct option - if false positive is same for all, the only crteria beomes which ones have the lowest false negative, in line with what the argument is recommending
The proportion of inconclusive test results is equal for all screening tests used to detect lead poisoning. if inconclusive are the same, we still have the choice between low false negatives or low false positives
The screening test which has the lowest proportion of false negative results causes side effects less frequently than other tests.This supports in a way, but the support lent is a weak one- just because a test has infrequent side effects doesnt mean that it should be adopted- as we cant assume side effects of tests to be a big distinguishig criterion. In fact the recommendation clearly states- in order to detect lead poisioning most accurately.. that is the purpose is accurate detection, and for that is the recommendation made, not for reduction of side effects
The treatment for lead poisoning, called chelation therapy, sometimes has serious side effects.If so, then a false positive will mean unnecessary exposure to this risk. in this way it supports avoiding tests with high proportion of false positives, or adoptiong tests with lowest proportion of false positives- this is in fact against the recommendation of the argument
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12 Jul 2011, 02:57
IMO-B..
OA and OE pls
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23 Jul 2011, 21:04
Nice question + 1 B
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24 Jul 2011, 19:17
+1 for B.

Crick
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25 Jul 2011, 07:08
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I got it wrong.
Nice one
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25 Jul 2011, 07:25
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WishMasterUA wrote:
I got it wrong.
Nice one

Me too. Not so easy.

I try to attack the central assumption in strengthen/weaken questions. What was the central assumption in this question?
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07 Aug 2011, 02:07
I got incorrect answer too . Nice question . Need more such questions for practice
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09 Aug 2011, 07:37
Nice question! Got it wrong though T.T
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10 Aug 2011, 09:19
+1 for B. This question is almost identical to another one just posted on this page:

cat-false-positive-118650.html
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Re: Before lead poisoning starts to cause serious damage, it can [#permalink]

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24 Jan 2015, 11:52
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Re: Before lead poisoning starts to cause serious damage, it can [#permalink]

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25 May 2016, 11:59
Hello from the GMAT Club VerbalBot!

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Re: Before lead poisoning starts to cause serious damage, it can [#permalink]

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16 Jan 2017, 23:02
Hi sayantanc2k and all,
I thought from the passage we are given that there are several tests for lead poisoning--a screening test is one of them.Every test could produce false positive or negative,but the screening test produce the least false negative.The conclusion is to strengthen that we should use the screening test over the other means to detect lead poisoning.

Option B just tells us that "all the screening tests" have the same proportion of false positive.Hence,it doesn't convince us to choose this method over the others.

What's the flaw in my reasoning?

Thanks
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Re: Before lead poisoning starts to cause serious damage, it can [#permalink]

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17 Jan 2017, 07:34
agdimple333 wrote:
Before lead poisoning starts to cause serious damage, it can be detected through a screening test. Every test sometimes produces false positives, indicating that the people tested have lead poisoning, when, in fact, they do not; a false negative indicates that people do not have lead poisoning when, in fact, they do. To detect lead poisoning most accurately, medical workers should use the screening test which has the lowest proportion of false negative results.

Which of the following, if true, most strongly supports the above recommendation?

The test with the lowest false negative rate also requires the most time-intensive laboratory procedures.
All screening tests used to detect lead poisoning have the same proportion of false positive results.
The proportion of inconclusive test results is equal for all screening tests used to detect lead poisoning.
The screening test which has the lowest proportion of false negative results causes side effects less frequently than other tests.
The treatment for lead poisoning, called chelation therapy, sometimes has serious side effects.

{{{the Analogy for false positive and negative is really tricky --it is based on conditional probability , read it in standard deviation by Gary smith---}}

B is correct because all the screening test have same proportion of false positive result , so the only way to test be effective to have low false negative result.strengthen the argument.
Re: Before lead poisoning starts to cause serious damage, it can   [#permalink] 17 Jan 2017, 07:34
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