In an experiment investigating the hypothesis that aerobic exercise improves concentration and memory, all the participants had an equal chance of being assigned to any of the three conditions in the study. The researchers have used _____to minimize the possibility of bias when assigning participants to the different groups.

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Random assignment ensures that participants have an equal chance of being assigned to any of the groups, minimizing the possibility of bias. The practice effect refers to the improvement in performance that can occur simply from repeated exposure to a task. The single-blind technique involves keeping the participants blind to the group they are in, while the researcher knows which group they are in. The double-blind technique involves keeping both the participants and the researcher blind to which group the participant is in. However, neither the single-blind nor the double-blind technique directly addresses the issue of bias in group assignment.

In an Experiment Investigating the Hypothesis That Aerobic Exercise Improves