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The arranging of experimental units or subjects into different groups so that the experimental units or subjects are similar to one another. this is done under the belief that the response to the treatment may potentially be different for the different groups.

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MissPhiladelphia
Usually experiments are done by random assignment of the subjects or objects. This helps the study reduce bias and other potential threats to the credibility of the study. Thank you for your question. Please don't hesitate to ask in Brainly your queries. 

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