Eric, Nick and Archi make contributions to the Society Of Nature Protection in the ratio of 5:3:2.5. If altogether
they contribute 5145 Nis, how much more money does Nick contribute than Archi?
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?