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Before lead poisoning starts to cause serious damage, it can

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Before lead poisoning starts to cause serious damage, it can [#permalink] New post 10 Jul 2011, 20:51
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A
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E

Difficulty:

  25% (medium)

Question Stats:

68% (01:55) correct 32% (01:38) wrong based on 44 sessions
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.

please only answer if you have reason to support your answer.
[Reveal] Spoiler: OA

Last edited by agdimple333 on 12 Jul 2011, 06:47, edited 1 time in total.
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Re: Lead poisioning - easy one [#permalink] New post 10 Jul 2011, 21:00
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.

please only answer if you have reason to support your answer.


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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Re: Lead poisioning - easy one [#permalink] New post 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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Re: Lead poisioning - easy one [#permalink] New post 12 Jul 2011, 02:57
IMO-B..
OA and OE pls
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Re: Lead poisioning - easy one [#permalink] New post 23 Jul 2011, 21:04
Nice question + 1 B
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Re: Lead poisioning - easy one [#permalink] New post 24 Jul 2011, 19:17
+1 for B.

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Re: Lead poisioning - easy one [#permalink] New post 25 Jul 2011, 07:08
I got it wrong.
Nice one
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Re: Lead poisioning - easy one [#permalink] New post 25 Jul 2011, 07:25
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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Re: Lead poisioning - easy one [#permalink] New post 07 Aug 2011, 02:07
I got incorrect answer too . Nice question . Need more such questions for practice
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Re: Lead poisioning - easy one [#permalink] New post 09 Aug 2011, 07:37
Nice question! Got it wrong though T.T
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Re: Lead poisioning - easy one [#permalink] New post 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
Re: Lead poisioning - easy one   [#permalink] 10 Aug 2011, 09:19
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Before lead poisoning starts to cause serious damage, it can

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