In order to maximize the likelihood that experimental and control groups are similar before any treatment has begun,researchers typically use

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Random assignment is the most effective method for ensuring that experimental and control groups are similar because it involves randomly assigning individuals to either group, which helps to minimize differences in participant characteristics that could affect the outcome of the study. Naturalistic observation, sampling, and observational studies are all useful research methods, but they do not guarantee that the groups will be comparable.

In Order to Maximize the Likelihood That Experimental and Control