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A researcher studying drug addicts found that, on average,

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Manager
Joined: 20 May 2006
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18 Sep 2006, 16:11
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90% (01:42) correct 10% (02:44) wrong based on 30 sessions

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A researcher studying drug addicts found that, on average, they tend to manipulate other people a great deal more than nonaddicts do. The researcher concluded that people who frequently manipulate other people are likely to become addicts.

Which of the following, if true, most seriously weakens the researcherâ€™s conclusion?

(A) After becoming addicted to drugs, drug addicts learn to manipulate other people as a way of obtaining drugs.
(B) When they are imprisoned, drug addicts often use their ability to manipulate other people to obtain better living conditions.
(D) People who are likely to become addicts exhibit unusual behavior patterns other than frequent manipulation of other people.
(E) The addicts that the researcher studied were often unsuccessful in obtaining what they wanted when they manipulated other people.
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18 Sep 2006, 16:45
(A) After becoming addicted to drugs, drug addicts learn to manipulate other people as a way of obtaining drugs.

If addicts learn to become manipulative after becoming one, then the researchers assertion that the people who are manipulative become addicts falls apart. The causal relationship is no longer evident.
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18 Sep 2006, 18:04
I agree it is A but the OA is E. Can somebody verify this?
VP
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18 Sep 2006, 18:10
I think I've seen this question before... whats the source? MGMAT?
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18 Sep 2006, 19:11
its from the 1000 cr document I found in the forum.
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20 Sep 2006, 01:34
govinam wrote:
its from the 1000 cr document I found in the forum.

The answers in the document are not a 100% right. Sad but true
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20 Sep 2006, 03:08
The OA is (A) .It is a OG question
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Manager
Joined: 14 Sep 2006
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20 Sep 2006, 06:04
Might be wrong but going to say D here as it directly addresses people before they become addicts. Tough choice between A & D.
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20 Sep 2006, 09:50
A, D is out of scope.
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20 Sep 2006, 13:18
A for me....simple causation type problem
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20 Sep 2006, 15:52
OA is A
This question is in the 1000 CR doc.
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01 May 2012, 00:20
1
KUDOS
Why is the answer not D? In the given case, the author concludes that manipulative behavior causes people to become addicts. Thus, A causes B. The CR bible says that if we can show that there are other factors at play that cause B, and A is not the only one, then it undermines or weakens the argument. The choice D tells us that manipulative behavior is the not the sole reason for people becoming addict, i.e. A alone is not responsible for the cause of B. Can't we take such a reasoning to say that D indeed is the correct choice?
Help appreciated.
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01 May 2012, 01:57
1
KUDOS
D is an information that just increases the knowledge; okay the guys can manipulate + do some other behavior also
but this information doesnt weaken to any extent. The argument talks of the case in bold

Hence A
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Manager
Joined: 02 Jan 2011
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02 May 2012, 02:22
Definitely A.

Option D provides additional information which is useless in this context.
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02 May 2012, 10:40
Yes, the answer is 100% A

This argument is the typical correlation causation problem we see with many CR questions. Researchers have found a high incidence of those who manipulate others within drug addicts. They conclude that it is the manipulation that leads people to become drug addicts.

To weaken the argument, we can:

1) Remove the manipulation and show that people are still drug addicts

2) Give an alternate cause for drug addiction, or

The only answer choice that clearly does any of the above, is A.

Choice D, as many people who posted above me said, does not specifically attack the argument. It is a very weak attempt at weakening the argument...
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03 May 2012, 05:16
Has to (a)

Option A strengthens the possibility of reverse causality

Posted from GMAT ToolKit
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GMAT Date: 04-30-2012

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03 May 2012, 08:25
A is the only option which weekens...
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28 Oct 2015, 10:50
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: A researcher studying drug addicts found that, on average,   [#permalink] 28 Oct 2015, 10:50
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