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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] New post 13 Jul 2004, 07:57
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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 workroom…
(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.

The asnwer is (B), why ?

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 [#permalink] New post 13 Jul 2004, 08:02
Because it offers another explanation of the increased productivity

If 100 people worked in a room which could hold only 65 their productivity was not optimal. Under the experiment, however, there remained only 50 people in the drab room which meant that their WORKING CONDITIONS IMPROVED
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 [#permalink] New post 13 Jul 2004, 08:53
Hi chunjuwu,

For the benefit of the group, could you please post the answer a little later? Only this would foster helpful discussions on the forum!
  [#permalink] 13 Jul 2004, 08:53
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In a study of the effect of color on productivity, 50 of 100

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