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Exposure to certain chemicals commonly used in elementary schools

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Director
Joined: 17 Oct 2005
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Exposure to certain chemicals commonly used in elementary schools [#permalink]

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17 Apr 2006, 03:26
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69% (02:22) correct 31% (01:31) wrong based on 451 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.

OG2017, CR635, P536
[Reveal] Spoiler: OA

Last edited by joemama142000 on 17 Apr 2006, 05:05, edited 2 times in total.
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Re: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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17 Apr 2006, 03:31
ans.. C
Director
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Re: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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17 Apr 2006, 03:51
Hallo ,
think that E) is best. The nurses assume that the proportion of the children in renston is not bigger now than 10 years ago, otherwise the conclusion would be wrong.
regards
VP
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Re: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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17 Apr 2006, 04:02
I'm going with A.
Director
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Re: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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17 Apr 2006, 04:10
^ E ^

is my choice but i have thought much
Director
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Re: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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17 Apr 2006, 05:05
A-os number vs. fraction
B-os not concerned with other
D-conclusion-students are more sensitive. Just cuz chemicals are found in homes does not mean students are more sensitive. The children could have the same sensitivity but more of them go to nurse because of chemicals from home.

The Oa is C but There is a debate btwn C and E. I chose E at first but E is close but it doesnt adress the children that are sent to the nusre. Just because there are more children now does not mean that they are sent to
the nurse becuase of greater sensitivity to the chemicals. ie,
Lets say presently: there is one nurse,proportion is 10 studentssent/nurse
out of 100 total students/nurse
before , there is one nurse, 5 students sent/nurse out of 50 total students/nurse
Just because the proportion increased does not make the arguement fall apart. Student could still have greater sensitivity
In C, if students are more likely now to be sent to the nurse for the allergy, then the argment falls apart. That means you can't compare before to now. You cant tell if sensitivity increased or not.
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Re: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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17 Apr 2006, 08:37
I go with A
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Re: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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18 Apr 2006, 15:00
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C.

joemama142000 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 Renstonâ€™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 Renstonâ€™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. correct, if childrens were not sent to nurses, 10 years ago the nurse would not have acconted allergy children 10 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 Renstonâ€™s population now than they did ten years ago. out of scope
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Re: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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21 Feb 2009, 23:54
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: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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22 Feb 2009, 01:22
e
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Re: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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22 Feb 2009, 02:53
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: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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22 Feb 2009, 08:56
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: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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22 Feb 2009, 09:14
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: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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22 Feb 2009, 11:34
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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: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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22 Feb 2009, 12:34
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: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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22 Feb 2009, 23:00
I think it's C.
All other choices are irrelevant.
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Re: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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22 Feb 2009, 23:05
OA C
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Re: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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09 Sep 2009, 02:15
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: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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09 Sep 2009, 03:02
IMO A

Nurses say that proportion of children sent to them has increased....

Conclusion blames greater exposure and increased sensitivity for increased numbers.

Logical assumption is that the number of nurses has not decreased....bcos if there are same number of nurses then the conclusion holds true, but if the number of nurses decreases then obviously the increase in student sent to the nurses will increased not bcos of the increased rate of students but bcos of decreased proportion of nurses.
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Re: Exposure to certain chemicals commonly used in elementary schools [#permalink]

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09 Sep 2009, 10:13
IMO, C.

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.

The argument depends on students being sent to them if they have an allergic reaction. If a mild reaction would not have warranted someone to be sent 10 years ago and now warrants one - independent of the actual severity of the reaction - then the argument fails.

--

I don't think it's A because they speak of the "proportion". I'm going out on a limb here but let's say 3 nurses watched 600 children and had 30 reactions (10 years ago). They would still base the total number of reactions on the student pool, not specifically how many cases they dealt with. This (I imagine) would hold true if 2 nurses are now employed and had 30 reactions over 600 children (despite the fact that they would increase their personal caseload by 50%).

I think I went way too convoluted into this. I still think it's C though.
Re: Exposure to certain chemicals commonly used in elementary schools   [#permalink] 09 Sep 2009, 10:13

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