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A study comparing a group of chronically depressed

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A study comparing a group of chronically depressed [#permalink] New post 28 Sep 2010, 21:11
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A study comparing a group of chronically depressed individuals with an otherwise matched group of individuals free from depression found significantly more disorders of the immune system among the depressed group. According to the researchers, these results strongly support the hypothesis that mental states influence the body's vulnerability to the infection.

Q: Which of the following, if true, cast the most serious doubt on the researcher's intepretation?

A: The researchers' view does little more than echo a familiar theme in folklore an literature
B Chronically depressed individuals are no less careful than others to avoid exposure to infections
C: Discorders of the immune system cause many of those inviduals who have them to become chronically depressed
D: Inviduals who have previously been free from depression can become depressed quite suddenly
E A high frequency of infections can stem from an unusally high level of exposure rather than from any disorder of the immune system

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Re: Infection and Depression [#permalink] New post 28 Sep 2010, 21:26
A- irrelevant
B- Strengthens the argument
C- Cause effect reversal. Right answer.
D- Not relevant
E- Its not about how infections stem. Its about how mental states affect body's vulnerability.
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Re: Infection and Depression [#permalink] New post 28 Sep 2010, 21:31
C for me too.
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Re: Infection and Depression [#permalink] New post 28 Sep 2010, 21:38
C to me:
Conclusion sates: "mental states influence the body's vulnerability to the infection"

Option C states that infection is causing the depressed mental state....
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Re: Infection and Depression [#permalink] New post 28 Sep 2010, 21:52
OA plz...
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Re: Infection and Depression [#permalink] New post 29 Sep 2010, 03:27
Used POE and only C makes sense.

Plus, researchers assumed that poor mental health will cause vunerability to infection. However, if it was the other way round, then the conclusion is invalid.

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Re: Infection and Depression [#permalink] New post 29 Sep 2010, 03:35
Please post the OA
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Re: Infection and Depression [#permalink] New post 29 Sep 2010, 03:54
Classic case of denying a reverse cause and effect.
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Re: Infection and Depression [#permalink] New post 29 Sep 2010, 05:05
It has to be C
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Re: Infection and Depression [#permalink] New post 29 Sep 2010, 09:04
IMO C
OA plz
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Re: Infection and Depression [#permalink] New post 29 Sep 2010, 09:27
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Thank you everyone.
Oa is c

So for weaken type of CR questions, it's ok for the right answer to be totally different from the premise?

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Re: Infection and Depression [#permalink] New post 29 Sep 2010, 10:02
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A correct answer choice to the weaken question will do one of the following:

1. Breaks down causality (As in this case, since it has reversed the cause-effect relationship by saying that they are depressed BECAUSE they have lesser immune capabilities, as opposed to being the other way around). This could mean reversal of cause-effect or proving that a relationship between cause and effect is non existent.
2. Suggest a missing link
3. Break down an assumption

In all these cases the key thing is to realize that the ANSWER choices are taken to be true. So yes, the stimulus can be "wrong" and very different from the answer choice so to speak.

Hope this helps.
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Re: Infection and Depression [#permalink] New post 29 Sep 2010, 20:08
MBAwannabe10 wrote:
A study comparing a group of chronically depressed individuals with an otherwise matched group of individuals free from depression found significantly more disorders of the immune system among the depressed group. According to the researchers, these results strongly support the hypothesis that mental states influence the body's vulnerability to the infection.

Q: Which of the following, if true, cast the most serious doubt on the researcher's intepretation?

A: The researchers' view does little more than echo a familiar theme in folklore an literature
B Chronically depressed individuals are no less careful than others to avoid exposure to infections
C: Discorders of the immune system cause many of those inviduals who have them to become chronically depressed
D: Inviduals who have previously been free from depression can become depressed quite suddenly
E A high frequency of infections can stem from an unusally high level of exposure rather than from any disorder of the immune system


Conclusion:
mental states influence the body's vulnerability to the infection.
Premise:
group of chronically depressed individuals with an otherwise matched group of individuals free from depression found significantly more disorders of the immune system among the depressed group

So to weaken the argument we have to show that mental state is not the only cause of the body's vulnerability to the infection
Option C defies the argument by stating that its the disorders of the immune system those cause the individual to become chronically depressed.
So C is totally opposite to the Argument

C is the ans
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Re: Infection and Depression [#permalink] New post 01 Oct 2010, 22:00
this question is very easy in terms of comparing other options..so once can eliminate all options except the right one :)
so i guess answer should be C.
Re: Infection and Depression   [#permalink] 01 Oct 2010, 22:00
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