People who live unusually long tend to have been lean young

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People who live unusually long tend to have been lean young [#permalink]

01 Feb 2008, 13:37

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7. People who live unusually long tend to have been lean young adults who went on to gain approximately one pound every year, so lean young adults can improve their chances of living a long life by gaining about a pound every year.
A flaw in the argument above is that it
(A) gives reasons for the truth of its conclusion that presuppose the truth of that conclusion
(B) proceeds as though a condition that by itself is enough to guarantee a certain result must always be present for that result to be achieved
(C) assumes without proof that two phenomena that occur together share an underlying cause
(D) concludes that one phenomenon is the cause of another when at most what has been established is an association between them
(E) fails to recognize that a tendency widely shared by a subgroup within a given population will not necessarily be widely shared by that population as a whole

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Re: Paper CR Test 42 [#permalink]

01 Feb 2008, 14:35

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Re: Paper CR Test 42 [#permalink]

01 Feb 2008, 15:01

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GMATBLACKBELT wrote:

(B) proceeds as though a condition that by itself is enough to guarantee a certain result must always be present for that result to be achieved the words "tend" and "chance" is used, so can't be a guarantee
(C) assumes without proof that two phenomena that occur together share an underlying cause doesn't assume this without any proof. The proof is provided.
(D) concludes that one phenomenon is the cause of another when at most what has been established is an association between them does not conclude this, just acknowleges the association in the argument, and recommends following one part of the association
(E) fails to recognize that a tendency widely shared by a subgroup within a given population will not necessarily be widely shared by that population as a whole the people who live longer are a subgroup, therefore applying their association with their weight to the whole population will not necessarily work. this is therefore the right ans in my opinion

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Re: Paper CR Test 42 [#permalink]

02 Feb 2008, 16:33

OA is D. I thought this one was very tough b/c many of the answer choices seem to fit the bill of what is being asked.

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Re: Paper CR Test 42 [#permalink]

30 Apr 2011, 03:10

it is very straight forward D , though E created a bit of confusion . i think less than 2 minutes is ok for this question
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Re: Paper CR Test 42 [#permalink]

01 May 2011, 09:57

the stem has a construction - since A tends to B so B must tend to A.
this is faulty and both options B and D seem to fit the bill.
i chose D though since it seemed better,but still need clarification why B is wrong.

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Re: Paper CR Test 42 [#permalink]

03 May 2011, 02:14

Why is B wrong?

It fits perfectly for me;

one pound each year -> live long

The flaw is that the author does not explain why one pound each year is the cause. It might be the effect of another cause, or there might be something else so there is a flaw of logic because the author does not make this cause as self sufficient to live longer...

Explanation please!

Re: Paper CR Test 42 [#permalink] 03 May 2011, 02:14

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