The procedure designed to ensure that the experimental and control groups do not differ in any way that might affect the experiment's results is called

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Random assignment is the procedure used to ensure that participants are distributed between the experimental and control groups in a random manner, eliminating the possibility of any pre-existing differences between individuals affecting the results of the experiment. The other options, variable controlling, representative sampling, and stratification, are important concepts in research design but are not specifically related to ensuring that the experimental and control groups are equivalent.

The Procedure Designed to Ensure That the Experimental and Control