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 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

Question

Quizplus · Accepted Answer

Random assignment ensures that each participant has an equal chance of being assigned to any of the conditions in the study, minimizing the possibility of bias. The practice effect is a potential confounding variable that could affect the results of the study, but it is not a method to minimize bias. The single-blind and double-blind techniques are methods used to control for bias in data collection and analysis, but they do not address bias in participant grouping.

In an Experiment Investigating the Hypothesis That Aerobic Exercise Improves