Research Methods Chapter 12: Experiments with More Than One Independent Variable

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6 Terms

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Interaction Effect

A result from a factorial design, in which the difference in the levels of one independent variable changes, depending on the level of the other independent variable; a difference in differences.

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Factorial Design

A study in which there are two or ore independent variables, or factors.

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Cell

A condition in an experiment; in a simple experiment, it can represent the level of one independent variable; in a factorial design, a cell represents one of the possible combinations of two independent variables.

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Main Effect

In a factorial design, the overall effect of one independent variable on the dependent variable, averging over the levels of the other independent variable.

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Marginal Means

In a factorial design, the arithmetic means for each level of an independent variable, averaging over the levels of another independent variable.

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Participant Variable

A variable such as age, gender, or ethnicity whose levels are selected (i.e., measured), not manipulated.