In an Experiment Investigating the Hypothesis That Aerobic Exercise Improves

Multiple Choice

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.

A) the practice effect
B) random assignment
C) the single-blind technique
D) the double-blind technique