In an experiment,participants must be randomly assigned to condition in order to avoid a social desirability bias.

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Random assignment to conditions is used to ensure that each participant has an equal chance of being placed in any group, which helps control for pre-existing differences among participants. Social desirability bias, where participants respond in a way they think is more socially acceptable, is a different issue that is not directly addressed by random assignment.

In an Experiment,participants Must Be Randomly Assigned to Condition in Order