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Researchers took a group of teenagers who had never smoked

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Researchers took a group of teenagers who had never smoked [#permalink] New post 08 Apr 2005, 14:01
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Researchers took a group of teenagers who had never smoked and for one year tracked whether they took up smoking and how their mental health changed. Those who began smoking within a month of the study’s start were four times as likely to be depressed at the study’s end than those who did not begin smoking. Since nicotine in cigarettes changes brain chemistry, perhaps thereby affecting mood, it is likely that smoking contributes to depression in teenagers.
Which of the following, if true, most strengthens the argument?
A. Participants who were depressed at the study’s start were no more likely to be smokers at the study’s end than those who were not depressed.
B. Participants who began smoking within a month of the study’s start were no more likely than those who began midway through to have quit smoking by the study’s end. C. Few, if any, of the participants in the study were friends or relatives of other participants.
D. Some participants entered and emerged from a period of depression within the year of the study.
E. The researchers did not track use of alcohol by the teenagers.
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 [#permalink] New post 08 Apr 2005, 15:05
definitely (A).

(A) says that the people who started smoking are mentall/biologically same as those who did not smoke.
Infact (A) is an assumption.
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 [#permalink] New post 09 Apr 2005, 07:41
I may be way off on this but I will go with 'B'

Conclusion: Smoking contributes to depression in teenagers.

A. Participants who were depressed at the study’s start were no more likely to be smokers at the study’s end than those who were not depressed.
This does not attack the conlcusion.

B. Participants who began smoking within a month of the study’s start were no more likely than those who began midway through to have quit smoking by the study’s end.
This is it, this fixes a potential flaw in the conclusion - which is - Smoking did not contribute to depression in teenagers but Quitting contributed to depression.
If people who started to smoke at the beginning were to quit at the end of it, quitting could be the reason why they are depressed.

C. Few, if any, of the participants in the study were friends or relatives of other participants.
Irrelevant.

D. Some participants entered and emerged from a period of depression within the year of the study.
Same as A

E. The researchers did not track use of alcohol by the teenagers.
Irrelevant
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Re: [#permalink] New post 26 Mar 2010, 15:39
rthothad wrote:
I may be way off on this but I will go with 'B'

Conclusion: Smoking contributes to depression in teenagers.

A. Participants who were depressed at the study’s start were no more likely to be smokers at the study’s end than those who were not depressed.
This does not attack the conlcusion.

B. Participants who began smoking within a month of the study’s start were no more likely than those who began midway through to have quit smoking by the study’s end.
This is it, this fixes a potential flaw in the conclusion - which is - Smoking did not contribute to depression in teenagers but Quitting contributed to depression.
If people who started to smoke at the beginning were to quit at the end of it, quitting could be the reason why they are depressed.

C. Few, if any, of the participants in the study were friends or relatives of other participants.
Irrelevant.

D. Some participants entered and emerged from a period of depression within the year of the study.
Same as A

E. The researchers did not track use of alcohol by the teenagers.
Irrelevant



i think the answer is A and here's my reason

A. if the smokers are those who were already depressed at the start of the experiment, then we could assume that those depressed people's own characters are more likely to cause the smoking tendency rather than nicotine does. so if we could eliminate the this possibility and make sure that depressed people were no more likely to become smokers than those who were not depressed, then it most strengthens the argument.

B. the argument is not relevant to the midway quitters. also, we couldnt see this kind of flaw in the argument that quitting contributes to smoking. its very clearly written in the argument that Smoking itself contributes to smoking bcuz nicotine changes brain chemistry.
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Re: Researchers took a group of teenagers who had never smoked [#permalink] New post 18 Jan 2012, 05:30
I still don;t understand how A is the answer.
All it says is - depression is not the reason for smoking.

And as per the argument, we have to prove that smoking contributes to depression. This can not be proved on the basis of A.

But, except A, nothing comes close and hence I select A.
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Re: Researchers took a group of teenagers who had never smoked [#permalink] New post 26 May 2012, 05:12
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Chembeti wrote:
I still don;t understand how A is the answer.
All it says is - depression is not the reason for smoking.

And as per the argument, we have to prove that smoking contributes to depression. This can not be proved on the basis of A.

But, except A, nothing comes close and hence I select A.


What i feel is -> Conclusion is: smoking (in teenagers) causes depression. X causes Y.

Option A -> Depression (in teenagers) does not causes Smoking. Y doesn't causes X. i.e It strengthens the conclusion by implying that The reverse causation is not possible. This is also one way to support/strengthen the conclusion.

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Re: Researchers took a group of teenagers who had never smoked [#permalink] New post 27 Jul 2013, 12:23
thank you mahtabmd ... got this wrong on GMATPrep your explanation hits the spot!
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Re: Researchers took a group of teenagers who had never smoked [#permalink] New post 28 Jul 2014, 04:19
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: Researchers took a group of teenagers who had never smoked   [#permalink] 28 Jul 2014, 04:19
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