What technique ensures that personal characteristics that might affect the outcome of the experiment are divided proportionally among the participants in the different groups, making groups equivalent?

Question

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Random assignment ensures that personal characteristics that might affect the outcome of the experiment are divided proportionally among the participants in the different groups, making groups equivalent. Dependent variables are the variables being measured in the experiment, independent variables are the variables being manipulated in the experiment, and statistics are used to analyze the data collected from the experiment.

What Technique Ensures That Personal Characteristics That Might Affect the Outcome