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

A. By making sure that participants give full consent prior to the experiment and are fully debriefed after the experiment.
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 allowing participants chose which group to participate in, instead of randomly assigning


Ans: B

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