The number of new cases of tuberculosis diagnosed in Country : GMAT Critical Reasoning (CR) - Page 2
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# The number of new cases of tuberculosis diagnosed in Country

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21 Jun 2008, 12:09
C for sure
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21 Jun 2008, 12:23
ldpedroso wrote:
The number of new cases of tuberculosis diagnosed in Country X increased dramatically this year. The country's news media have speculated that the sharp increase in new cases is the result of the tuberculosis outbreak that occurred in neighboring Country Y last year. Health officials in Country X have therefore proposed that all visitors from Country Y must submit to a medical examination before entering Country X.

Which of the following, if true, most strongly suggests that the proposed medical examinations will not help curb the spread of tuberculosis in Country X?

a) Country Z, which also neighbors Country Y, has not experienced an increase in cases of tuberculosis.
> Irrelevant
b) Current medical technology is not capable of detecting all carriers of tuberculosis.
> This will help to a certain degree. Not "all" carriers will be detected but surely "some" can be detected
c) Country X does not have the resources to examine all visitors from Country Y.
> This will help to a certain degree because even if 50% of visitors are examined, they may be able to prevent it to some degree
d) Tuberculosis is not spread through human contact.
> This will not be helpful 100%.
e) Citizens of Country Y will not travel to Country X if the proposal is implemented.
> Irrelevant.

I disagree with the OA...
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22 Jun 2008, 21:16
ldpedroso: You should post the OA. YOur question was posted on 8 June.
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23 Jun 2008, 07:07
D doesnt work, even if tuberculosis is not spread through human contact, country x wont let the infected in, so they will control it. One can hypothesise that one doesnt have to travel to country x in order to infect someone there but its out of scope.

C doesnt work, if country X does not have the resources to examine all visitors, they will let in only the examined healthy ones.

B works, if someone infected appears to be healthy he will get in.

Where do you people get these ambigious CRs from?
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Re: CR - Turbeculosis Cases [#permalink]

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23 Jun 2008, 07:57
i think D is best..

it says that animals could be carriers or insects..then in that case inspecting visitors from Y wont help!
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23 Jun 2008, 09:46
Or it could be that its spread through human breath from a close range, or any other non-contact way that would do no harm, out of scope.
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23 Jun 2008, 11:02
This question has been discussed on TestMagic and the OA is D according to them.

http://www.urch.com/forums/gmat-critica ... try-x.html
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23 Jun 2008, 12:22
Then OA is wrong, like I said just because its not spread via human contact, doesnt mean that its not spread in the non-contact way that would require infected persons to enter the country x in order to spread the infection there.

Whos the author of this one, testmagic ,gmac?
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23 Jun 2008, 12:38
dearxavier is right about D being incorrect irrespective of what OA is posted elsewhere. I have found several incorrect OAs in this forum in a relativley short period of time. However, I disagree with his/her answer choice.
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23 Jun 2008, 18:58
ldpedroso wrote:
The number of new cases of tuberculosis diagnosed in Country X increased dramatically this year. The country's news media have speculated that the sharp increase in new cases is the result of the tuberculosis outbreak that occurred in neighboring Country Y last year. Health officials in Country X have therefore proposed that all visitors from Country Y must submit to a medical examination before entering Country X.

Which of the following, if true, most strongly suggests that the proposed medical examinations will not help curb the spread of tuberculosis in Country X?

a) Country Z, which also neighbors Country Y, has not experienced an increase in cases of tuberculosis.
b) Current medical technology is not capable of detecting all carriers of tuberculosis.
c) Country X does not have the resources to examine all visitors from Country Y.
d) Tuberculosis is not spread through human contact.
e) Citizens of Country Y will not travel to Country X if the proposal is implemented.

I disagree with the OA...

Conclusion:. Health officials in Country X have therefore proposed that all visitors from Country Y must submit to a medical examination before entering Country X.
Assumption made -Visitors are source/carriers of infection

B weakens the arguments.Country X considers only humans as carriers.Infection may spread thru air,water,mosquoites...
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24 Jun 2008, 08:45
I disagree that B weakens the argument. The argument health officials make is that visitors from Country Y are the likely source of infection and therefore must submit to medical examinations before entering country X so as to reduce the exposure of inhabitants of X to infected visitors from Y.
Answer B states that “current medical technology is not capable of detecting all carriers of TB”. Because current medical technology does not detect ALL carriers does not mean the use of such technology will not “curb” the spread of TB as required by the question stem if it is true that infected travelers from Y spread the disease in X.
If it is true, then current medical technology need not detect “ALL” infected carriers of TB to “curb” the spread of TB in X. Rather, it only need detect some of the infected travelers from Y. Any reduction will curb the spread. The question does not ask what will eliminate the spread.
In order to weaken the argument made by health officials one must demonstrate the people from Country Y are not the likely source of infection in Country X not that current medical technology does not detect “ALL” carriers. By noting that other countries bordering Y have not experienced the same increase in TB as Country X, we recognize that Country Y is not likely the root source.
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24 Jun 2008, 09:22
OK ...Pedro...its time to post the OA.
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24 Jun 2008, 12:40
I think it B....

No OA is not good, can we change the datatype of Kudos..Instead of whole number, it should be an integer.....
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Re: CR - Turbeculosis Cases [#permalink]

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28 Jun 2008, 11:41
comebackkid wrote:
I disagree that B weakens the argument. The argument health officials make is that visitors from Country Y are the likely source of infection and therefore must submit to medical examinations before entering country X so as to reduce the exposure of inhabitants of X to infected visitors from Y.
Answer B states that “current medical technology is not capable of detecting all carriers of TB”. Because current medical technology does not detect ALL carriers does not mean the use of such technology will not “curb” the spread of TB as required by the question stem if it is true that infected travelers from Y spread the disease in X.
If it is true, then current medical technology need not detect “ALL” infected carriers of TB to “curb” the spread of TB in X. Rather, it only need detect some of the infected travelers from Y. Any reduction will curb the spread. The question does not ask what will eliminate the spread.
In order to weaken the argument made by health officials one must demonstrate the people from Country Y are not the likely source of infection in Country X not that current medical technology does not detect “ALL” carriers. By noting that other countries bordering Y have not experienced the same increase in TB as Country X, we recognize that Country Y is not likely the root source.

I agree with you that B does not weaken the conclusion.
b) Current medical technology is not capable of detecting all carriers of tuberculosis.
Can not detect all but may detect some carriers (such as people or others) ==> help curb the spread ==> strengthen the conclusion (even not very much)

I still choose C.

rajesh04 wrote:
I think it B....

No OA is not good, can we change the datatype of Kudos..Instead of whole number, it should be an integer.....

No OA is not good
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28 Jun 2008, 19:01
Lexis, here are my reasons as to why C is not the correct answer with a brief look at my discussion from above :

The argument health officials advance is that visitors from Country Y are the likely source of infection and therefore must submit to medical examinations before entering country X so as to reduce the exposure of inhabitants of X to infected visitors from Y.

Answer C states “Country X does not have the resources to examine all visitors from Country Y”. It is not relevant whether X can examine ALL visitors from Y. In fact, anything less than “ALL” logically encompasses zero visitors from Y to all minus one visitors from Y. While this may not be readily apparent it is what choice C states.

Again, the questions stem asks for the answer choice that most strongly supports the argument by health officials that visitors from Country Y are the likely source of infection and therefore must submit to medical examinations before entering country X so as to reduce the exposure of inhabitants of X to infected visitors from Y.

Because Country X does not have the resources to examine “ALL” visitors from Country Y does not mean that the examinations it performs will not “curb” the spread of TB in X.

Clearly, if Country X examines some number less than ALL of the visitors of Y, say 75% of the visitors form Y, and they prevent some number of infected visitors from Y then the examinations will successfully help “curb” the spread of TB. The burden is not to “eliminate” the spread of TB. Rather, it is merely to “curb” its spread.

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Re: CR - Turbeculosis Cases [#permalink]

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29 Jun 2008, 07:08
ldpedroso wrote:
The number of new cases of tuberculosis diagnosed in Country X increased dramatically this year. The country's news media have speculated that the sharp increase in new cases is the result of the tuberculosis outbreak that occurred in neighboring Country Y last year. Health officials in Country X have therefore proposed that all visitors from Country Y must submit to a medical examination before entering Country X.

Which of the following, if true, most strongly suggests that the proposed medical examinations will not help curb the spread of tuberculosis in Country X?

a) Country Z, which also neighbors Country Y, has not experienced an increase in cases of tuberculosis.
b) Current medical technology is not capable of detecting all carriers of tuberculosis.
c) Country X does not have the resources to examine all visitors from Country Y.
d) Tuberculosis is not spread through human contact.
e) Citizens of Country Y will not travel to Country X if the proposal is implemented.

An interesting question. First, the use of 'tuberculosis' here is a red herring. CR questions do not test your knowledge of medical conditions; they test your ability to analyze an argument. Our prior knowledge of tuberculosis- that it's spread through human contact- might influence our answer here, and lead us to an incorrect analysis of the argument. Indeed, D asks us to assume something we know to be false in real life. We should not think of tuberculosis at all; we might replace 'tuberculosis' in the question with any other condition- 'insomnia', or 'stress', or 'depression', for example.

Then the structure of the argument becomes clear. There is a 'post hoc ergo propter hoc' fallacy- just because one thing happens after another does not mean one thing was caused by the other. The argument says: "Y had high levels of stress (or whatever you like) last year. X had high levels of stress this year. Therefore stress in Y caused stress in X." This is not a valid argument, at least not without further support. It may just be coincidence that X had high levels of stress the year after Y did. High levels of stress might be caused by environmental factors, economic conditions, political turmoil, etc...

The assumption is that visitors from Y brought 'stress' to X. Answer D suggests that people do not transmit stress- that the cause lies elsewhere. D is the correct answer. It's not 'airtight', of course; we can imagine scenarios where the screening would be helpful even if human contact is not the cause, but these all seem unlikely. D "most strongly suggests" that the screening won't be effective, even if it is not 100% convincing.

I'd note, finally, that B and C must be incorrect, even if we grant the assumption that tuberculosis is contagious. If tuberculosis is contagious, even screening some of the visitors from Y will reduce the spread of the disease. As has been pointed out, the question does not ask whether the medical examinations will completely eradicate tuberculosis. A is incorrect because we have no knowledge of Country Z; Country Z might have been screening all their visitors for tuberculosis for years, which might be the reason Z had no increase. Indeed, were that true, A would help to support the argument, not weaken it.
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Re: CR - Turbeculosis Cases [#permalink]

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29 Jun 2008, 07:17
comebackkid wrote:
D is not correct because human contact is irrelevant. If a carriers brings the disease to X then perhaps it is spread through the use of drinking fountations or in the air when an infected person coughs. CONTACT is not required but that does not mean that carriers cannot spread the disease in another way after entering X from Y.

I'd also add that in medical terms, 'contact' means 'exposure' or 'proximity'. If a disease is spread by coughing, it is said to be spread by human contact. From the Mac dictionary:

"a disease transmitted through casual contact": touch, touching; proximity, exposure.
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14 Jul 2008, 16:33
Sorry for taking so long. I've been traveling...
The OA here is D, source Manhattan GMAT Prep
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14 Jul 2008, 16:52
IanStewart wrote:
ldpedroso wrote:
The number of new cases of tuberculosis diagnosed in Country X increased dramatically this year. The country's news media have speculated that the sharp increase in new cases is the result of the tuberculosis outbreak that occurred in neighboring Country Y last year. Health officials in Country X have therefore proposed that all visitors from Country Y must submit to a medical examination before entering Country X.

Which of the following, if true, most strongly suggests that the proposed medical examinations will not help curb the spread of tuberculosis in Country X?

a) Country Z, which also neighbors Country Y, has not experienced an increase in cases of tuberculosis.
b) Current medical technology is not capable of detecting all carriers of tuberculosis.
c) Country X does not have the resources to examine all visitors from Country Y.
d) Tuberculosis is not spread through human contact.
e) Citizens of Country Y will not travel to Country X if the proposal is implemented.

An interesting question. First, the use of 'tuberculosis' here is a red herring. CR questions do not test your knowledge of medical conditions; they test your ability to analyze an argument. Our prior knowledge of tuberculosis- that it's spread through human contact- might influence our answer here, and lead us to an incorrect analysis of the argument. Indeed, D asks us to assume something we know to be false in real life. We should not think of tuberculosis at all; we might replace 'tuberculosis' in the question with any other condition- 'insomnia', or 'stress', or 'depression', for example.

Then the structure of the argument becomes clear. There is a 'post hoc ergo propter hoc' fallacy- just because one thing happens after another does not mean one thing was caused by the other. The argument says: "Y had high levels of stress (or whatever you like) last year. X had high levels of stress this year. Therefore stress in Y caused stress in X." This is not a valid argument, at least not without further support. It may just be coincidence that X had high levels of stress the year after Y did. High levels of stress might be caused by environmental factors, economic conditions, political turmoil, etc...

The assumption is that visitors from Y brought 'stress' to X. Answer D suggests that people do not transmit stress- that the cause lies elsewhere. D is the correct answer. It's not 'airtight', of course; we can imagine scenarios where the screening would be helpful even if human contact is not the cause, but these all seem unlikely. D "most strongly suggests" that the screening won't be effective, even if it is not 100% convincing.

I'd note, finally, that B and C must be incorrect, even if we grant the assumption that tuberculosis is contagious. If tuberculosis is contagious, even screening some of the visitors from Y will reduce the spread of the disease. As has been pointed out, the question does not ask whether the medical examinations will completely eradicate tuberculosis. A is incorrect because we have no knowledge of Country Z; Country Z might have been screening all their visitors for tuberculosis for years, which might be the reason Z had no increase. Indeed, were that true, A would help to support the argument, not weaken it.

Good explanation Ian.
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Re: CR - Turbeculosis Cases [#permalink]

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26 Sep 2010, 11:39
B and C also equally weakens the argument.
Re: CR - Turbeculosis Cases   [#permalink] 26 Sep 2010, 11:39

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