How do researchers account for individual differences in an experiment, statistically?

A. By having participants self-report any unique characteristics they may have and then coding those differences as values of error.
B. By using random assignment to make individual differences about the same in each group.
C. By using a test statistic to determine the likelihood that something other than the manipulation caused differences in a dependent measure between groups.
D. By having participants all give the same response on the same dependent measure in each group


Ans: C

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