Unit 11

• Cell


  A single entry in a table, sometimes used to refer to one condition in an experiment, or to a combination on a factorial design
• Factorial design


  An experiment with more than one independent variable, with each factor having at least two levels
• Interaction


  When the effect of one independent variable on the dependant variable depends on the level of another independent variable

  • calculated as 2^k-1-k (k = number of IV)
• IV*PV Design


  A factorial design that includes both an experimental independent variable and a non-experimental participant variable
• Levels


  A technique to control for order effects without having all possible orders
• Main effect


  The direct effect of an independent variable on a dependant variable, ignoring any interactions with other variables

  • number of main effects depends on how many independent variables there are
• Marginal mean


  The average score of all participants in one condition of one independent variable, collapsing across all other variables
• Mixed Factorial Design


  Includes both between and with-in subjects design
• Moderator Variable


  A third variable that influences the relationship between an independent variable and a dependent variable
• Simple Main Effect


  The effect of one independent variable on the dependent variable, at one particular level of another independent variable

  • number of simple main effects depends on how many levels of independent variables there are
• 2x2 always has 2 main effects and 1 interaction

  3x2x2 always has 3 main effects and 4 interactions