Blocking is a procedure that lets extraneous factors operate during an experiment but assures - by virtue of the random selection of experimental units and their subsequent random assignment to experimental and control groups - that each treatment has an equal chance to be enhanced or handicapped by these factors.

Question

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Blocking is a technique used to control for the effects of extraneous factors by grouping similar experimental units together, not by random assignment, to ensure that these factors do not confound the results.

Blocking Is a Procedure That Lets Extraneous Factors Operate During