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How many variables do factorial designs have?

Includes two or more independent variables.


What are factorial designs?

Essentially two (or more) studies in one.


What can we do by testing more than one variable in factorial designs?

By testing more than one independent variable at a time, we can look at the interactive effects of independent variables.


What do most variables in psychology do?

Interact with other independent variables.


When do interaction effects occur?

Occur when a combination of variables has a special effect.


What are post hoc comparasions?

The significant main effects and / or interactions allow us to further investigate the individual cell means.