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Matching subjects in research designs

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How can matching subjects make the groups more equivalent? If you match your subjects on their ability to perform well on an intelligence quotient (IQ) test and you distribute the matched pairs over two groups, then does this seem to make sense if you are looking at two different methods for dealing with stress? Why? When does such a study make sense, and when does it not make sense?
Justify your answers with appropriate reasoning and research.

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How can matching subjects make the groups more equivalent?
Matching subjects ensures that as many extraneous variables are controlled for as possible. The goal of experiments is to show the difference between two or more independent variables and that any other factor that could account for the results is eliminated or controlled for as best as possible. By creating equivalent groups through matching subjects you are allowing for the independent variable to influence the dependent variable and not outside factors (i.e., age, IQ, ...

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