In experimental research, a study when a participant is assigned to the experimental or the control group entirely by chance, is called:

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Random assignment is a process used in experimental research where participants are assigned to either the experimental group or the control group at random, ensuring that each participant has an equal chance of being placed in any group. This method helps to eliminate selection bias, ensuring that the groups are comparable at the start of the experiment.

In Experimental Research, a Study When a Participant Is Assigned