16. 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, proba-
bly 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 manufac-
turing 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
(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
17. Not scored