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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] New post 21 Feb 2009, 22:54
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

82% (02:00) correct 18% (00:44) wrong based on 10 sessions
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.
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Re: CR: Chemicals [#permalink] New post 22 Feb 2009, 00:22
e
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Re: CR: Chemicals [#permalink] New post 22 Feb 2009, 01:53
I think its D but not sure.Plz help.

A. The number of school nurses employed by Renston’s elementary schools has not decreased over the past ten years.
-- number of school nurses have nothing to do with argument so OOS.
B. Children who are allergic to the chemicals are no more likely than other children to have allergies to other substances.
-- Since we are talking about allergies to chemicals so allergies to other substances is again OOS.
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.
-- if children with allergic reactions are not sent to school nurses then the number shouldn't have increased as nurses report,so this couldn't be an assumption.
D. The chemicals are not commonly used as cleaners or pesticides in houses and apartment buildings in Renston.
-- This may be an assumption,since the argument starts with saying children are allergic to chemicals used in school but it may be possible that the use of chemicals in houses and apartments has increased which results in increased allergic reactions.
E. Children attending elementary school do not make up a larger proportion of Renston’s population now than they did ten years ago.
-- If the children attending the school don't make a large proportion now than they did 10 years ago then it doesn't justify the increased number of allergic reactions.
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Re: CR: Chemicals [#permalink] New post 22 Feb 2009, 07:56
reply2spg 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.


C should be it. D is included in the information provided by the stimulus ( Renston's school children have been exposed to greater quantities of chemicals )
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Re: CR: Chemicals [#permalink] New post 22 Feb 2009, 08:14
Option 'C' says that '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' -- If this were to be assumed then the statement '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' becomes false.

Can anybody explain plz.
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Re: CR: Chemicals [#permalink] New post 22 Feb 2009, 10:34
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nitindas wrote:
Option 'C' says that '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' -- If this were to be assumed then the statement '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' becomes false.

Can anybody explain plz.


IMO 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'- is the assumption so try to negate this statement and negation will hurt the conclusion.

'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'
In this case more children are sent to the nurse therefore the incidences are reported more and allergic reactions has not increased significantly.
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Re: CR: Chemicals [#permalink] New post 22 Feb 2009, 11:34
O M G! Answer choice A's are being such a big trap on tough CR Q's

For example, this Q uses one such trap. The number of nurses going down only affects the proportion of students sent to them, not the exposure level/sensitivity as expected in the conclusion.
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Re: CR: Chemicals [#permalink] New post 22 Feb 2009, 22:00
I think it's C.
All other choices are irrelevant.
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Re: CR: Chemicals [#permalink] New post 22 Feb 2009, 22:05
OA C
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Re: CR: Chemicals [#permalink] New post 25 Sep 2009, 11:01
C.
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Re: CR: Chemicals [#permalink] New post 06 Nov 2013, 10:44
nitindas wrote:
Option 'C' says that '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' -- If this were to be assumed then the statement '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' becomes false.

Can anybody explain plz.



C is the assumption because C option eliminates the alternative cause (more children tend to be sent to school now) to confirm the reasons mentioned in the conclusion (exposed to greater quantity of chemicals or children now are more sensitive to chemicals than ten years ago ).

Option D: weaken
Option E: strengthen
Re: CR: Chemicals   [#permalink] 06 Nov 2013, 10:44
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