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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]

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17 Aug 2006, 03:34
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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 researcherâ€™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 system.
(C) People with high immune-system activity cannot develop mental illness.
(D) Mental illness does not cause peopleâ€™s immune-system activity to decrease.
(E) Psychological treatment of mental illness is not as effective as is medical treatment.

The researcherâ€™s conclusion would be most seriously weakened if it were true that

(A) there was a one-year delay between the completion of a pilot study for the experiment and the initiation of the experiment itself
(B) peopleâ€™s levels of immune-system activity are not affected by their use of medications
(C) a few people with high immune-system activity had scores on the test of mental health that were similar to the scores of people who had normal immune-system activity
(D) people who have low immune-system activity tend to contract more viral infections than do people with normal or high immune-system activity
(E) high levels of stress first cause mental illness and then cause decreased immune-system activity in normal individuals
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17 Aug 2006, 04:40
1. (B) Reinforced in the argument/POE
2. (E) Suggests an alternative cause (overwork or sustained levels of stress)
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17 Aug 2006, 05:31
On the first one, why would (D) be out?

Its assuming that mental illness is not the cause of low immune activity. Wouldn't this assumption need to be in place if the hypothesis is that low immune activity leads to mental illness? Please explain.
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17 Aug 2006, 05:37
AGree with D and E
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17 Aug 2006, 07:29
Q1: D.
If mental illness causes the immune system activity to decrease then it means its not the immune system that causes the mental illness.

Q2: E
Conclusion: A causes B
Choice E says conclusion is not true its B that causes A.
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17 Aug 2006, 07:53
Agree with D and E.
17 Aug 2006, 07:53
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