Exposure to certain chemicals commonly used in elementary : GMAT Critical Reasoning (CR)
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Exposure to certain chemicals commonly used in elementary

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Exposure to certain chemicals commonly used in elementary [#permalink]

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07 Aug 2010, 13:59
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100% (02:12) correct 0% (00:00) wrong based on 8 sessions

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Exposure to certain chemicals commonly used in elementary schools as cleaners or pesticides causes allergic reactions in some children. Elementary school nurses in Renston report that the proportion of schoolchildren sent to them for treatment of allergic reactions to those chemicals has increased significantly over the past ten years. Therefore, either Renston’s schoolchildren have been exposed to greater quantities of the chemicals, or they are more sensitive to them than schoolchildren were ten years ago.

Which of the following is an assumption on which the argument depends?

A. The number of school nurses employed by Renston’s elementary schools has not decreased over the past ten years.
B. Children who are allergic to the chemicals are no more likely than other children to have allergies to other substances.
C. Children who have allergic reactions to the chemicals are not more likely to be sent to a school nurse now than they were ten years ago.
D. The chemicals are not commonly used as cleaners or pesticides in houses and apartment buildings in Renston.
E. Children attending elementary school do not make up a larger proportion of Renston’s population now than they did ten years ago.
[Reveal] Spoiler: OA

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Last edited by dkverma on 08 Aug 2010, 02:46, edited 1 time in total.
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07 Aug 2010, 14:33
I guess C?
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07 Aug 2010, 21:22
C it is
negate C and the argument will fall apart.
Children who have allergic reactions to the chemicals are more likely to be sent to a school nurse now than they were ten years ago.
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07 Aug 2010, 21:55
dkverma wrote:
Exposure to certain chemicals commonly used in elementary schools as cleaners or pesticides causes allergic reactions in some children. Elementary school nurses in Renston report that the proportion of schoolchildren sent to them for treatment of allergic reactions to those chemicals has increased significantly over the past ten years. Therefore, either Renston’s schoolchildren have been exposed to greater quantities of the chemicals, or they are more sensitive to them than schoolchildren were ten years ago.

Which of the following is an assumption on which the argument depends?

A. The number of school nurses employed by Renston’s elementary schools has not decreased over the past ten years.
B. Children who are allergic to the chemicals are no more likely than other children to have allergies to other substances.
C. Children who have allergic reactions to the chemicals are not more likely to be sent to a school nurse now than they were ten years ago.
D. The chemicals are not commonly used as cleaners or pesticides in houses and apartment buildings in Renston.
E. Children attending elementary school do not make up a larger proportion of Renston’s population now than they did ten years ago.

IMO A...

If the number of school nurses employed by Renston’s elementary schools has decreased during last decade than in that case the number of students sent per nurse would automatically increase.......negating impact of qualities of chemical or sensitivity of children....
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08 Aug 2010, 04:08
C
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08 Aug 2010, 09:37
Going great guns !

tryingharder wrote:
C it is
negate C and the argument will fall apart.
Children who have allergic reactions to the chemicals are more likely to be sent to a school nurse now than they were ten years ago.

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09 Aug 2010, 01:40
mustdoit wrote:

IMO A...

If the number of school nurses employed by Renston’s elementary schools has decreased during last decade than in that case the number of students sent per nurse would automatically increase.......negating impact of qualities of chemical or sensitivity of children....

A is incorrect, the number of school nurses is not the focus, the focus is the number of children sent to the infirmary, not sent to the nurses.

This is Defender Assumption problem. The conclusion gives us 2 possible reasons, we must negate the 3rd or other possible reasons. C done exactly that.
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09 Aug 2010, 04:31
nusmavrik wrote:
Going great guns !

tryingharder wrote:
C it is
negate C and the argument will fall apart.
Children who have allergic reactions to the chemicals are more likely to be sent to a school nurse now than they were ten years ago.

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Re: Allergic Reaction   [#permalink] 09 Aug 2010, 04:31
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