When every participant has an equal chance of being assigned to any group in an experiment this is termed:

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Random assignment ensures that participants have an equal chance of being assigned to any group, which helps reduce the effects of confounding variables and increases the internal validity of the study. Random sampling, on the other hand, refers to selecting participants randomly from the population of interest, and is not directly related to group assignment in experiments. Participant bias and manipulation of the independent variable are also not the same as random assignment.

When Every Participant Has an Equal Chance of Being Assigned