In order to reduce the likelihood that the experiment's results will be due to any preexisting differences between groups, the participants in a study are placed in the experimental and control based on:

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Placing participants in experimental and control groups based on chance (random assignment) is the method used to reduce the likelihood that the experiment's results will be due to any preexisting differences between the groups. This ensures that each participant has an equal chance of being assigned to any group, minimizing bias and making the groups as similar as possible at the start of the experiment.

In Order to Reduce the Likelihood That the Experiment's Results