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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 18 Oct 2005, 19:38
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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.
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 [#permalink] New post 18 Oct 2005, 19:40
Straight A!
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Re: CR: Lab mice [#permalink] New post 18 Oct 2005, 20:02
Clear A. these are the 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 of equal strength.
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 [#permalink] New post 18 Oct 2005, 20:25
A right away !! This supports that stress enchances developement of cancerous cells.
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 [#permalink] New post 18 Oct 2005, 21:32
A too

be careful with D, it is not an assumption, it is a deeper conclusion than the one that is already given in the statement
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 [#permalink] New post 18 Oct 2005, 22:17
Antmavel wrote:
A too

be careful with D, it is not an assumption, it is a deeper conclusion than the one that is already given in the statement


Thanks Antmavel, I actually fell to this trap.
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 [#permalink] New post 19 Oct 2005, 04:06
OA is A.
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 [#permalink] New post 19 Oct 2005, 08:35
The key word here is stress enhances the development of cancer.

If A were not true, then the argument would fall apart.
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 [#permalink] New post 19 Oct 2005, 20:48
A is the assumption. As suggested my Himalaya, I would not dispute B also.
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 [#permalink] New post 20 Oct 2005, 12:21
A bit late, but I also agree that A is the correct answer
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 [#permalink] New post 20 Oct 2005, 13:17
A for me too.
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 [#permalink] New post 20 Oct 2005, 13:18
A for me too.
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Re: CR: Lab mice [#permalink] New post 20 Oct 2005, 14:27
New Joinee.
A for me too.
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 [#permalink] New post 21 Oct 2005, 09:27
clearly A. Try to negate it and the conclusion would fall apart..
  [#permalink] 21 Oct 2005, 09:27
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