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An investigator divided 84 adults into two distinct groups

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An investigator divided 84 adults into two distinct groups [#permalink] New post 10 Jan 2012, 20:41
00:00
A
B
C
D
E

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  5% (low)

Question Stats:

87% (01:52) correct 13% (01:57) wrong based on 15 sessions
An investigator divided 84 adults into two distinct groups...

I agree with E, But can anyone please explain how to negate A...??
[Reveal] Spoiler: OA

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Re: Weaken Argument [#permalink] New post 10 Jan 2012, 22:39
here it is a cause and effect question

A (high caffeine) causes B(high Anxiety) but what if B(high Anxiety) causes A (high caffeine)
Hence E
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Re: Weaken Argument [#permalink] New post 11 Jan 2012, 08:16
I negate A for the following reasons:

1. Pay attention to use of the phrase "Some subjects" in A. This comparison is among the same group members and it is still possible that those members might be experiencing higher levels of anxiety than those in the other group.

or

2. Even though those 'some subjects' experience lower levels of anxiety than those in other group, we can ignore this fact because they are just some

Hope these reasons are enough.
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Re: Weaken Argument [#permalink] New post 11 Jan 2012, 11:57
+1 E

I think that A gives the same information of the question stem.
There are people who have more anxiety than ohers in a group.
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Re: Weaken Argument [#permalink] New post 12 Jan 2012, 07:23
Thanks Guys got it......
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Re: Weaken Argument [#permalink] New post 25 Jan 2012, 23:29
Premise: Caffeine and Anxiety are correlated. Investigator found that high caffeine and anxiety occur together.HC ------- HA
Conclusion: High levels of Caffeine result in high levels of anxiety. HC-----> HA
So, basically, what the investigator is assuming is that high levels of anxiety does not result in ppl consuming high levels of caffeine. HC<-----X---HA
Choice E directly attacks that assumption, weakening the conclusion.

Hope it helps,
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Re: Weaken Argument [#permalink] New post 27 Jan 2012, 16:15
The explanation is very clear
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Re: Weaken Argument [#permalink] New post 10 Jul 2012, 01:32
Straight E.

Anxiety actually caused increased caffeine consumption, not the other way round, as erroneously stated by the conclusion. Some call this question type cause-and-effect fallacy.

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Re: Weaken Argument   [#permalink] 10 Jul 2012, 01:32
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