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A researcher discovered that people who have low levels of

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A researcher discovered that people who have low levels of [#permalink] New post 04 Jul 2011, 07:43
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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 activity does.
(B) Mental illness is similar to physical disease in its effects on body systems.
(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) Psychological treatment of mental illness is not as effective as is medical treatment.
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Re: A researcher discovered that people who [#permalink] New post 04 Jul 2011, 07:52
the stimulus states a correlation that : low level of immune system => bad mental health.
now option D, if false would state the exact oppsotie ie : bad mental health => low level immune system
so, for our conclusion to stand option D should be true.
Ans D

whats the OA, masterBaten80? (sorry, just could resist making the pun)

hope my explanation helped
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Re: A researcher discovered that people who [#permalink] New post 04 Jul 2011, 09:34
yes OA is D.
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Re: A researcher discovered that people who [#permalink] New post 03 Sep 2011, 02:30
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wats wrong with C?
on negation, it also destroys the conclusion...
plz explain
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Re: A researcher discovered that people who [#permalink] New post 15 Sep 2011, 05:17
siddharthasingh wrote:
wats wrong with C?
on negation, it also destroys the conclusion...
plz explain

Well, negation technique cannot be used for all the options. Because, on negating, some out-of-scope and irrelevant answers could also come true.

So, it is recommended that negation technique be used after you've eliminated the out-of-scope and irrelevant to the argument options.

Assuming that you've had C and D as close contenders,

C is wrong because it generalizes that high immune people cannot become mentally-ill. However, the question stem talks only about 'protection' in the conclusion.
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Re: A researcher discovered that people who [#permalink] New post 18 Sep 2011, 02:29
Imo D
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Re: A researcher discovered that people who [#permalink] New post 20 Sep 2011, 20:43
+1 for D. Gud Question.

Negate D & the argument falls apart. Negation is a strong technique to confirm the correct answer.
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Re: A researcher discovered that people who have low levels of [#permalink] New post 22 Jul 2012, 02:30
Why not B? If B is negated then also the argument falls flat..also if we dont use negation technique, option B is more apt than option D (IMO)

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Re: A researcher discovered that people who have low levels of [#permalink] New post 23 Jul 2012, 19:13
B is a very tempting answer here because the conclusion bundles together mental health and physical disease. This problem type, however, is a very specific CR assumption subtype. In this subtype, the argument will present two factors that demonstrate correlation - in this case Immune System and Mental Illness. The conclusion asserts a causation (without any rationale) from one factor to the next - here the argument concludes that the Immune System protects against Mental Illness. The implicit assumption in that line of reasoning is that the causation does NOT go in the other direction or in other words you have to assume that Mental Illness does not impact the immune system. Answer choice D states that assumption correctly.

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Re: A researcher discovered that people who have low levels of   [#permalink] 23 Jul 2012, 19:13
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