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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 10 Dec 2009, 16:13
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57% (02:25) correct 43% (01:45) wrong based on 214 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.

Can somebody explain ?

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Re: Nice and confusing CR ?! [#permalink] New post 11 Dec 2009, 09:16
I think it should be C.

The nurse observes that a greater proportion of the students are being sent to her to be treated for allergic reactions. She concludes that either students are more sensitive to the chemicals or that they are being exposed to more of the chemicals. The questions asks on what assumption her argument depends.

C. States states that children are not more likely to be sent to the nurse for allergic reactions to chemicals tens years ago. To draw her conclusion, she must assumes that children are just as likely to be sent to the nurse now as they were before. If children are most likely to be sent to the nurse than before, then the increase can be a result of that, and not exposure to more chemicals or increased sensitivity.
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Re: Nice and confusing CR ?! [#permalink] New post 17 Dec 2009, 12:52
seluka 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?

Give away: cleaners or pesticides causes allergic/proportion of schoolchildren who are allergic reactions to those chemicals has increased significantly over the past ten years/ conclusion: increase because either 1.) expose to greater quantity or 2.) children are more sensitive.
A. The number of school nurses employed by Renston’s elementary schools has not decreased over the past ten years. -->#of nurses is irrelevant
B. Children who are allergic to the chemicals are no more likely than other children to have allergies to other substances. -->other substances are irrelevant
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. --> suggests that children are sent NOT because of those above 2 reasons,for example, NOT BECAUSE the school nurse is more accessible, NOT BECAUSE parents aware more of the allegic and told childeren to go to school nurse. (Assumption Q: alternative to the conclusion type.)
D. The chemicals are not commonly used as cleaners or pesticides in houses and apartment buildings in Renston. -->weakening
E. Children attending elementary school do not make up a larger proportion of Renston’s population now than they did ten years ago. --> children proportion to population is irrelevant
Can somebody explain ?
[Reveal] Spoiler:
C


My ans is C
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Re: Nice and confusing CR ?! [#permalink] New post 18 Dec 2009, 17:54
My answer is C.

The argument is based on the number of students visiting the nurses over the 10 year span.
For a conclusion this number needs to be constant all throughout. Therefore the argument is based on this assumption
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Re: Exposure to certain chemicals commonly used in elementary [#permalink] New post 06 Nov 2013, 07:28
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Re: Exposure to certain chemicals commonly used in elementary [#permalink] New post 09 Nov 2013, 01:58
IMO C:
Premise:Nurses have reported a increase in proportion of school children sent to them for treatment of allergic reactions over the past ten years.
conclusion: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.
Now the premise and conclusion would stand true if the number of children getting and reporting allergic reactions due to exposure to these chemicals has increased and not just number of children reporting allergic reactions has increased....
Only C satisfies this condition....
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Re: Exposure to certain chemicals commonly used in elementary [#permalink] New post 25 Oct 2014, 04:07
I read in most of the answer explanations that choice A is irrelevant. Choice A is wrong, but certainly not irrelevant, because if the number of nurses decrease and the number of children remain constant, then every nurse will be treating more children than he / she used to 10 years ago.

But this assumption assumes that the number of children have remain same / not decreased, thus the choice A holds wrong.
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Re: Exposure to certain chemicals commonly used in elementary   [#permalink] 25 Oct 2014, 04:07
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