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Two groups of laboratory mice were injected with cancerous

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Two groups of laboratory mice were injected with cancerous [#permalink] New post 26 Apr 2010, 20:01
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Two groups of laboratory mice were injected with cancerous cells. One group’s cages were rotated in a disorienting manner. Two-thirds of these mice developed cancers. One-tenth of the mice in stationary cages developed cancers. The researchers concluded that stress enhances the development of cancer in laboratory mice.
The researchers’ conclusion logically depends on which of the following assumptions?
(A) Rotating the cages in disorienting manner produced stress in the mice in those cages.
(B) The injections given to the two groups of mice were not of equal strength.
(C) Injecting the mice with cancerous cells caused stress in the mice.
(D) Even without the injections the mice in the rotated cages would have developed cancers.
(E) Even the rotation of cages in a manner that is not disorienting is likely to produce stress in mice in those cages.

Please elaborate with reasoning.
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Re: CR assumption question [#permalink] New post 26 Apr 2010, 23:10
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poohv005 wrote:
Two groups of laboratory mice were injected with cancerous cells. One group’s cages were rotated in a disorienting manner. Two-thirds of these mice developed cancers. One-tenth of the mice in stationary cages developed cancers. The researchers concluded that stress enhances the development of cancer in laboratory mice.
The researchers’ conclusion logically depends on which of the following assumptions?
(A) Rotating the cages in disorienting manner produced stress in the mice in those cages.
(B) The injections given to the two groups of mice were not of equal strength.
(C) Injecting the mice with cancerous cells caused stress in the mice.
(D) Even without the injections the mice in the rotated cages would have developed cancers.
(E) Even the rotation of cages in a manner that is not disorienting is likely to produce stress in mice in those cages.

Please elaborate with reasoning.


Mice Injected >>> Disoriented Rotation >>> Stress >>> Cancer

Only A supports the sequence of event, by asserting that "rotation of cage causes stress"
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Re: CR assumption question [#permalink] New post 27 Apr 2010, 12:19
A it is.

nverma already explained it.
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Re: CR assumption question [#permalink] New post 28 Apr 2010, 04:19
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IMO A.

poohv005 wrote:
Two groups of laboratory mice were injected with cancerous cells. One group’s cages were rotated in a disorienting manner. Two-thirds of these mice developed cancers. One-tenth of the mice in stationary cages developed cancers. The researchers concluded that stress enhances the development of cancer in laboratory mice.
The researchers’ conclusion logically depends on which of the following assumptions?
(A) Rotating the cages in disorienting manner produced stress in the mice in those cages. [Correct. A proper cause (cage rotation) >> effect (stress) is shown here]
(B) The injections given to the two groups of mice were not of equal strength. [We dont know if it anyhow related with stress. Incorrect]
(C) Injecting the mice with cancerous cells caused stress in the mice. [This is Shell Game Fallacy. What about the stationery caged mice. They should be in 2/3 ratio. Incorrect]
(D) Even without the injections the mice in the rotated cages would have developed cancers. [We are not given this info on no injection. This is contradicting the data. Incorrect]
(E) Even the rotation of cages in a manner that is not disorienting is likely to produce stress in mice in those cages. [This is a case of alternate cause for same effect (stress). Remember, there has to be only one cause for a stated effect.Incorrect]

Please elaborate with reasoning.

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Re: CR assumption question [#permalink] New post 29 Apr 2010, 04:28
perhaps the easiest of the LSAT questions...A sure it is
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Re: CR assumption question [#permalink] New post 07 May 2011, 14:29
A in 0:41 min , this is sub-200 level question
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Re: CR assumption question [#permalink] New post 07 May 2011, 16:59
Very easy to be a LSAT question.
But still (A).
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Re: CR assumption question [#permalink] New post 09 May 2011, 09:55
+1 A

That's right, it is a sub 600 level question.
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Re: CR assumption question [#permalink] New post 09 May 2011, 21:01
A negating this clearly crashes the conclusion.
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Re: Two groups of laboratory mice were injected with cancerous [#permalink] New post 12 Dec 2011, 06:44
More cancer in disordering cages. So movement creating stress and stress creating cancer.
Answer. A
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Re: Two groups of laboratory mice were injected with cancerous [#permalink] New post 12 Dec 2011, 21:02
Choice A connect the bridge between the rotating cages and cancer. That is stress.
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Re: CR assumption question [#permalink] New post 23 Dec 2011, 04:48
garimavyas wrote:
this is sub-200 level question

Does below 200 exist in GMAT? I thought the lowest possible score in GMAT was 200. :)

Btw, I agree with A, though I would "classify" this problem as "sub-600-level", if at all.
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Re: Two groups of laboratory mice were injected with cancerous [#permalink] New post 26 Dec 2011, 02:24
A ..
connects dot between stress and cancerous
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Re: Two groups of laboratory mice were injected with cancerous [#permalink] New post 23 Jan 2012, 05:40
Premises: Two groups of laboratory mice were injected with cancerous cells. (Let us say Group1)One group’s cages were rotated in a disorienting manner. Two-thirds of these mice developed cancers. (Let us say group 2) One-tenth of the mice in stationary cages developed cancers.

Conclusion - The researchers concluded that stress enhances the development of cancer in laboratory mice.
The researchers’ conclusion logically depends on which of the following assumptions?
(A) Rotating the cages in disorienting manner produced stress in the mice in those cages.
(B) The injections given to the two groups of mice were not of equal strength.
(C) Injecting the mice with cancerous cells caused stress in the mice.
(D) Even without the injections the mice in the rotated cages would have developed cancers.
(E) Even the rotation of cages in a manner that is not disorienting is likely to produce stress in mice in those cages.

We can see from the premises that the incidences of cancer in group 1 were more than group 2. just keep in mind that this has something to do with rotation in a disorienting manner.
Conclusion talks about stress.
Missing link: relationship between disorienting rotation and stress

Disorienting rotation--cancer + (Assumption) ----> Stress---> cancer Hence, A
B. Wrong because wither group could have gotten the injection with more strength.
C. in this case, both groups have an equal chance of getting cancer
D. out of scope
E. this compares oriented rotation. has nothing to do with disoriented rotation vs stationary.

OR just use LEN technique on A
(A) Rotating the cages in disorienting manner had not necessarily produced stress in the mice in those cages. the conclusion falls apart.
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Re: Two groups of laboratory mice were injected with cancerous [#permalink] New post 23 Jan 2012, 09:33
Clear A
but not sub 600
I'd say 650-700
Re: Two groups of laboratory mice were injected with cancerous   [#permalink] 23 Jan 2012, 09:33
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