Ryan wanted to study the effect of adult play with preschoolers on the children's noisiness. So, he went to one preschool for a week and played with the children during breaks. At the end of the week, he measured their noisiness. For comparison purposes, he found another preschool across town and measured their noisiness as well to see the effect of playing with the children. The group of
preschool children who got to play with Ryan was the
a. the pretest.
b. the posttest.
c. the independent variable.
d. the experimental group.
e. the control group.
D
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