Chemical pregnancy tests that measure the presence of human : GMAT Critical Reasoning (CR)
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Chemical pregnancy tests that measure the presence of human

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Chemical pregnancy tests that measure the presence of human [#permalink]

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21 Jan 2012, 12:09
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82% (02:27) correct 18% (01:38) wrong based on 82 sessions

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Chemical pregnancy tests that measure the presence of human chorionic gonadtropin (HCG) sometimes exhibit a false negative, indicating that the woman is not pregnant when in fact she is; the tests can also give a false positive response, indicating that the woman is pregnant when she actually is not. Consumers should seek the pregnancy test with the lowest proportion of false negative results in order to most accurately detect pregnancy with an at-home test.

The conclusion to the left is most strongly supported by which of the following, if true?

a) Some ultrasounds can detect pregnancy as early as one week into the gestation.
b) Early symptoms of a pregnancy can include nausea, increased hunger, and disturbed sleep patterns.
c) Prenatal medical supervision should begin as soon after conception as possible.
d) All at-home pregnancy tests have the same rate of inconclusive test results.
e) All at-home pregnancy tests produce the same proportion of false positive results.

OA is E. Any idea how? Also, what to look for in these types of questions?
[Reveal] Spoiler: OA

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21 Jan 2012, 19:30
Answer should be E. Here is how.

There is a leap in the argument. You just need to identify the leap. Argument says pregnancy tests have false negtives and false positives. However, people should choose the pregnancy test with the lowest proportion of false negative results. The two statements need to be connected somehow for the conclusion to be correct. Conclusion is that people should choose the ones with the lowest proportion on False "Negative results". Which basically implies that there is more of a reason to chose these ones. That additional reason is only provided by E. If the false possitive ones rate is the same for all products, the only other thing that could help you make a choice is the difference in the "False Negative" ones.

Hence E
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21 Jan 2012, 21:17
If all at-home pregnancy tests produce the same proportion of false positive results,then only one criteria is left to select the best test and it is the one which gives the lowest proportion of false negative results,hence E strengthens the conclusion.
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21 Jan 2012, 21:38
First, you have to identify what is the scope of the question. What is the stimulus talking about?
It is talking about the chemical pregnancy tests, so if there are options that talk about other topics. They are wrong. That's the case of choices A, B, and C.

In the case of D, the stimuls doesn't talk about inconclusive test results.

I suggest to read the CR Bible of Powerscore. It's a great book.
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Re: Chemical pregnancy tests that measure the presence of human [#permalink]

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12 Sep 2012, 20:32
Process of elimination works here. But no way I can conclude the E the correct ans. . Experts please help.

I did not get a satisfactory ans. I also faced the same question from Grockit. Any one knows any similar OG question
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Re: Chemical pregnancy tests that measure the presence of human [#permalink]

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12 Sep 2012, 21:06
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sujit2k7 wrote:
Process of elimination works here. But no way I can conclude the E the correct ans. . Experts please help.

I did not get a satisfactory ans. I also faced the same question from Grockit. Any one knows any similar OG question

(E) is definitely the right answer here. Forget the process of elimination for a while. Think what the argument is telling you:

Premises: Pregnancy tests sometimes exhibit a false negative. The tests can also give a false positive.
Conclusion: Seek the test with the lowest proportion of false negative results in order to most accurately detect pregnancy with an at-home test.

So even before I look at the options, my issue is that 'most accurate detection' should include fewest 'false negatives' AND ALSO fewest 'false positives'.

The conclusion states that you need to look for lowest proportion of 'false negative' to accurately detect pregnancy. It doesn't say anything about 'false positive' which is not good. What would make the conclusion better i.e. strengthen it?
If I am told that all tests produce the same proportion of 'false positives', then it makes sense that I only need to worry about the 'false negative' proportion. It certainly makes the conclusion stronger.

Hence (E)
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Re: Chemical pregnancy tests that measure the presence of human [#permalink]

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12 Sep 2012, 22:03
thnkx Karishma
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Re: Chemical pregnancy tests that measure the presence of human   [#permalink] 12 Sep 2012, 22:03
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