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To cut costs, a high school modified its airconditioning system to

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To cut costs, a high school modified its airconditioning system to [#permalink]

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New post 21 Oct 2017, 00:37
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Difficulty:

  55% (hard)

Question Stats:

58% (01:12) correct 42% (01:32) wrong based on 104 sessions

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To cut costs, a high school modified its airconditioning system to increase its efficiency. The modified system, however, caused the humidity in the school air to decrease by 18 percent. Twenty-four hours after the decrease in air humidity, a 25 percent increase in the number of visits to the school nurse was reported. This shows that a decrease in humidity can make people ill.

The argument depends on assuming which one of the following?

(A) At least some of the visits to the school nurse after the system was modified were due to illness.
(B) Most of the students at the high school suffered from the decrease in air humidity.
(C) It takes 24 hours after a person is infected with a virus for that person to exhibit symptoms.
(D) A decrease of 18 percent in air humidity causes an increase of 25 percent in one’s probability of becoming ill.
(E) Modifying the air-conditioning system proved to be an ineffective way to cut costs.

Source: LSAT
[Reveal] Spoiler: OA

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Re: To cut costs, a high school modified its airconditioning system to [#permalink]

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New post 21 Oct 2017, 00:57
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Masshole wrote:
To cut costs, a high school modified its airconditioning system to increase its efficiency. The modified system, however, caused the humidity in the school air to decrease by 18 percent. Twenty-four hours after the decrease in air humidity, a 25 percent increase in the number of visits to the school nurse was reported. This shows that a decrease in humidity can make people ill.

The argument depends on assuming which one of the following?

(A) At least some of the visits to the school nurse after the system was modified were due to illness.
(B) Most of the students at the high school suffered from the decrease in air humidity.
(C) It takes 24 hours after a person is infected with a virus for that person to exhibit symptoms.
(D) A decrease of 18 percent in air humidity causes an increase of 25 percent in one’s probability of becoming ill.
(E) Modifying the air-conditioning system proved to be an ineffective way to cut costs.

Source: LSAT


Premise -
18% decrease in humidity ----> 25% increase in nurse visits

Conclusion -
So humidity decrease---> MAKES ---> People ill

Negate A - None of the visits to the school nurse after the system was modified were due to illness -- Conclusion shatters....

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Re: To cut costs, a high school modified its airconditioning system to [#permalink]

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New post 21 Oct 2017, 01:46
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Option A is the right answer.
Decrease in air humidity caused an increase in the visits by the nurse.The argument is assuming that at least some of these visits were due to an increase in humidity.
The Conclusion is "This shows that a decrease in humidity can make people ill."
This conclusion is shattered when we negate Option A.
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Re: To cut costs, a high school modified its airconditioning system to   [#permalink] 21 Oct 2017, 01:46
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To cut costs, a high school modified its airconditioning system to

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