PSYB01H3 Study Guide - Final Guide: Internal Validity, Selection Bias, Square Root
Document Summary
Two or more independent variables that are qualitatively different. Multifactorial designs are identified by a numbering notation. Number of numbers = how many independent variables. Number of values = how many levels of each independent variable. Number of conditions = product of the numbering notation. Two independent variables: gaze direction (direct / indirect), facial muscle contraction (anger / fear) Numbering nomenclature: a 2 by 2 within design. Participants made anger / fear judgments of faces and reaction time was recorded. The effects of each independent variable on the dependent variable. Row means = the averages across levels of one independent variable. Column means = the averages across levels of the other independent. When the effects of one level of the independent variable depend on the particular level of the other independent variable. A significant interaction should be interpreted before the main effects. A line graph of the simple main effects is useful for examining the interaction.
