In a study of the effect of color on productivity, 50 of 100 : GMAT Critical Reasoning (CR)
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In a study of the effect of color on productivity, 50 of 100

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In a study of the effect of color on productivity, 50 of 100 [#permalink]

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New post 04 Sep 2010, 04:52
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In a study of the effect of color on productivity, 50 of 100 factory workers were moved from their drab workroom to a brightly colored workroom. Both these workers and the 50 who remained in the drab workroom increased their productivity, probably as a result of the interest taken by researchers in the work of both groups during the study.
Which of the following, if true, would cast most doubt upon the author’s interpretation of the study results given above?
(A) The 50 workers moved to the brightly colored room performed precisely the same manufacturing task as the workers who remained in the drab workroom.
(B) The drab workroom was designed to provide adequate space for at most 65 workers.
(C) The 50 workers who moved to the brightly colored workroom were matched as closely as possible in age and level of training to the 50 workers who remained in the drab work-room.
(D) Nearly all the workers in both groups had volunteered to move to the brightly colored workroom.
(E) Many of the workers who moved to the brightly colored workroom reported that they liked the drab workroom as well as or better than they liked the brightly colored workroom.
[Reveal] Spoiler: OA
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Re: CR prob [#permalink]

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New post 04 Sep 2010, 06:05
Argument:
A study conducted to know the effect of color on workers. 50 workers were moved to a brightly colored room. Both group performed similarly & increased the productivity since researchers were interested in their job.
The correct option will prove that there were other reasons for improvement in the productivity.
Option B – Gives a reason why the productivity was low in the drab room. If the space was too small for the workers to work then they would not have performed. By moving a part of the workers extra space was created for them to work effectively. So this extra space and not the interest of the researchers in the workers’ jobs was responsible for increased productivity.
Answer - B
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Re: CR prob [#permalink]

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New post 04 Sep 2010, 06:11
The argument is causal. The reasercher's study is responsible for the increase in performance.

We need the third factor to break this causation. B is the third factor - the drab room was conducive to the performance because it was big enough to house 65 workers simultaneously. Hence B.
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Re: CR prob   [#permalink] 04 Sep 2010, 06:11
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