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An intuitive research example of an interaction effect involves the relationship between psychotherapy and a patient's motivation. Generally, the positive impact of receiving psychotherapy is significantly stronger among individuals who are highly motivated to change compared to those who lack such motivation. This represents an interaction because the effectiveness of one independent variable (whether or not the person receives therapy) relies entirely on the specific level of a second independent variable (the individual's degree of motivation).

Interaction Between Psychotherapy and Motivation

A researcher finds that psychotherapy leads to much greater improvement among patients who are highly motivated to change than among patients who lack motivation. In this example, what does the term 'interaction' refer to?

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