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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 27 May 2007, 10:48
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A researcher discovered that people who have low levels of immune-system activity tend to score much lower on test 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 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.




OA D

I cannot understand why the answer is not A

Please help. Thanks!

Last edited by gablaze23 on 28 May 2007, 10:28, edited 1 time in total.
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Re: SC: Immune System (from OG Verbal) [#permalink] New post 27 May 2007, 11:55
It's not A b/c the research isn't comparing high-level immune systems to normal-level. The only comparison is between low-level versus both normal and high-level immune systems.

I thought this was going to be an SC question, but it looks to be CR.
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Re: SC: Immune System (from OG Verbal) [#permalink] New post 27 May 2007, 12:02
gablaze23 wrote:
A researcher discovered that people who have low levels of immune-system activity tend to score much lower on test 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 protects against mental illness better than normal immune-system activity does we talk about low immune system and mental ability.
out of scope
(B) Mental illness is similar to physical disease in its effects on body systems

out of scope for the conclusion
(C) People with high immune-system activity cannot develop mental illness.

out of scope .

(D) Mental illness does not cause people's immune-system activity to decrease
correct
(E) Psychological treatment of mental illness is not as effective as is medical treatment.

out of scope.


OA D

I cannot understand why the answer is not A

Please help. Thanks!
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 [#permalink] New post 29 May 2007, 06:04
D.
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 [#permalink] New post 29 May 2007, 09:28
Quote:
A researcher discovered that people who have low levels of immune-system activity tend to score much lower on test 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 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.


B) and E) are irrelevant.

I think A) is wrong for the reason explained by soul_assassin. C) is also wrong for the same reason.

I also go with D).
The researcher is concluding that low immune system activity is causing mental illness, not other way around(mental illness causing low immune activity).
If assumption in D) is negated, the conclusion becomes invalid.
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Re: CR: Immune System (from OG Verbal) [#permalink] New post 29 May 2007, 18:16
gablaze23 wrote:
A researcher discovered that people who have low levels of immune-system activity tend to score much lower on test 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 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.




OA D

I cannot understand why the answer is not A

Please help. Thanks!


ANswer should be "C"
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 [#permalink] New post 29 May 2007, 18:21
it should be D.
As the question assumes that the viceversa cannot be true that is the mental illness might have caused the lower immune system.
~sara
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 [#permalink] New post 29 May 2007, 20:52
D !
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"Education is what remains when one has forgotten everything he learned in school."

  [#permalink] 29 May 2007, 20:52
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