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A $$2 \times 2 \times 2$$ factorial design contains three independent variables with two levels each, producing eight total conditions. For example, psychotherapy type, psychotherapy length, and therapist sex could each have two levels, creating all combinations of those factors.

Example of a $$2 \times 2 \times 2$$ Factorial Design

If a researcher uses a 2 x 2 x 2 factorial design to investigate the effects of psychotherapy type, psychotherapy length, and therapist sex, how many total conditions are produced in this study?

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