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# A researcher discovered that people who have low levels of

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Manager
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A researcher discovered that people who have low levels of [#permalink]

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27 Aug 2009, 05:22
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A researcher discovered that people who have low levels of immune-system activity tend to score much lower on tests of mental health than do people with normal or high immune-system activity. The researcher concluded from this experiment that the immune system protects against mental illness as well as against physical disease.

The researcher's conclusion depends on which of the following assumptions

A) High immune-system activity protects against mental illness better than normal immune system activty does.
B) Mental illness is similar to physical disease in its effect on the body
C) People with high immune-system activity cannot develop mental illness
D) Mental illness does not cause people's immune-system activity to decrease
E ) Phychological treatment of mental illness is not as effective as is medical treatment.

Will post the OA in a bit - justify your response
If you have any questions
New!
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Re: Researchers and Low Level Immune [#permalink]

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30 Aug 2009, 09:51
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abhi758 wrote:
Thanks Boeinz you are right.. But why not option C? because when we apply the denial test to it, the conclusion that the immune system protects against mental illness falls apart..

not exactly

Premise: people who have low levels of immune-system activity tend to score much lower on tests of mental health than do people with normal or high immune-system activity.

Conclusion: immune system protects ---> mental illness
immune system protects ---> physical disease.

if you logically negate option C

People with high immune-system activity cannot develop mental illness --->

People with high immune-system activity can develop mental illness, the argument is still valid. As far as I understand the argument only says that immune system protects but not that people with a high immune-system cannot develop mental illness.

Consider the following problem

According to a recent study people who take regularly vitamin C are less likely to cancer than people who doesn't. Using this evidence a researcher concluded that vitamin C helps protect against cancer.

The researcher's conclusion depends on which of the following assumptions

People who take high levels of vitamin C cannot contract cancer.

I know the problem is not exactly the same but I just made it up. I hope it's now more clear for you.
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Re: Researchers and Low Level Immune [#permalink]

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01 Mar 2010, 00:32
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ExecMBA2010 wrote:
mikeCoolBoy wrote:
you're welcome. This is a tough question. Also option B is really tempting

Hi Mike,

Can B be a 2nd answer? In other words, D is the best answer but if we assume D is not in the list will B be an answer? I think B also is an assumption for the conclusion but we have a better option D in this case so we chose D. Is that correct?

Hi ExecMBA2010
Not really. There aren't second good choices on the GMAT, there will always be a correct answer choice and the others are incorrect for a reason.

if you logically negate B you get

Mental illness is NOT similar to physical disease in its effect on the BODY

If you read this closely it refers to the effects on the BODY, but the conclusion is broader than that since it just compares mental illness and physical disease so even if you negate B the argument is still valid and B is not an assumption.

Let me know whether this helps or it is still unclear for you.
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Re: Researchers and Low Level Immune [#permalink]

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29 Mar 2010, 05:35
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RaviChandra wrote:
Good Question thanku its D

Hey RaviChandra
Appreciate you seeing an active member of this forum.
But I would be happy if you give your inputs and explanations rather than saying thnku
and D it is or whatever the OA is.

Dude don't get my words wrong. If you start giving explanations it will benefit you in your real GMAT test.
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Re: Researchers and Low Level Immune [#permalink]

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27 Aug 2009, 05:28
would go for D

level immune activity determines presence/absense of mental illness.
for the conclusion to hold, the causality must not be reversed. D brings this out.
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Re: Researchers and Low Level Immune [#permalink]

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27 Aug 2009, 05:34
D.
It is being assumed that A (low-immunity) leads to B (mental disease) and not the other way around. If B led to A, the argument would fall apart.
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Re: Researchers and Low Level Immune [#permalink]

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27 Aug 2009, 06:02
I'm confused with "as well as from physical disease"

I'll go with B. As for me, it's clear from the test that immune system protects from mental illness. But says nothing 'bout physical diseases. B states that mental and physical illness have same properties. So we can expect that immune system can protect from physical illness as well

My choice B
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Re: Researchers and Low Level Immune [#permalink]

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27 Aug 2009, 08:23
The argument claims that low-immune system causes low score on tests of mental health. Therefore, if the mental health causes itself causes immune system to decrease,the statement will be false. so the answer should be "D"
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Re: Researchers and Low Level Immune [#permalink]

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27 Aug 2009, 09:10
IMO B

Because, new topic that is introduced in the conclusion is 'physical disease', not mentioned earlier in the evidence. Moreover, 'B' mentions that mental illness and physical disease are similar in effect on the body, leading to the conclusion given in the stimulus.
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Re: Researchers and Low Level Immune [#permalink]

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27 Aug 2009, 19:45
abhi758 wrote:
IMO B

Because, new topic that is introduced in the conclusion is 'physical disease', not mentioned earlier in the evidence. Moreover, 'B' mentions that mental illness and physical disease are similar in effect on the body, leading to the conclusion given in the stimulus.

B states that they [mental illness and physical disease] share the same effects on the body but does not state that they are similarly influenced by immune system. Hence i think B is incorrect.
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Re: Researchers and Low Level Immune [#permalink]

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28 Aug 2009, 04:38
OA is D - the link of causality is established
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Re: Researchers and Low Level Immune [#permalink]

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30 Aug 2009, 08:40
Thanks Boeinz you are right.. But why not option C? because when we apply the denial test to it, the conclusion that the immune system protects against mental illness falls apart..
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Re: Researchers and Low Level Immune [#permalink]

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30 Aug 2009, 10:30
Ahh thats suffices.. thanks a lot CoolBoy that was really kewl..
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Re: Researchers and Low Level Immune [#permalink]

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30 Aug 2009, 10:47
you're welcome. This is a tough question. Also option B is really tempting
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Re: Researchers and Low Level Immune [#permalink]

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05 Oct 2009, 23:19
imo-d,
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Re: Researchers and Low Level Immune [#permalink]

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28 Feb 2010, 10:22
mikeCoolBoy wrote:
you're welcome. This is a tough question. Also option B is really tempting

Hi Mike,

Can B be a 2nd answer? In other words, D is the best answer but if we assume D is not in the list will B be an answer? I think B also is an assumption for the conclusion but we have a better option D in this case so we chose D. Is that correct?
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Re: Researchers and Low Level Immune [#permalink]

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29 Mar 2010, 01:49
Good Question thanku its D
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Re: Researchers and Low Level Immune [#permalink]

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06 Apr 2010, 05:07
D it is.
In cause and effect, this assumption makes sure that it is not the other way round.
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Re: A researcher discovered that people who have low levels of [#permalink]

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24 Jun 2016, 21:57
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Re: A researcher discovered that people who have low levels of   [#permalink] 24 Jun 2016, 21:57
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