A research method that involves selecting matched groups of subjects, giving them different treatments, controlling unrelated factors and checking for differences in group responses, in order to understand cause- and- effect relationships is known as:

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Quizplus · Accepted Answer

The description provided matches the experimental research method, which involves selecting matched groups of subjects, administering different treatments, controlling unrelated factors, and checking for differences in group responses in order to establish a cause-and-effect relationship between the treatment and the outcome.

A Research Method That Involves Selecting Matched Groups of Subjects