Which method does NOT use random assignment to assign participants to groups?

Question

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Basing group assignment on the order in which participants arrive to be studied does not use random assignment. This method is more prone to selection bias and does not guarantee equal representation of characteristics in both groups. Random assignment, on the other hand, helps minimize the effects of potential confounding variables and ensures that any observed differences in outcomes between groups can be attributed to the treatment or intervention being studied.

Which Method Does NOT Use Random Assignment to Assign Participants