Chapter 10

• Factor


  An independent variable in a factorial design.
• Factorial design


  An experimental design in which more than one independent variable is manipulated.
• Higher-order interaction


  An interaction effect involving more than two independent variables.
• Interaction

  • The effect of one independent variable changes across the levels of another independent variable.
  • Can only be detected in factorial designs.
• Main effect

  • The action of a single independent variable in an experiment.
  • The change in the dependent variable produced by the various levels of a single factor.
• Shorthand notation


  A system that uses numbers to describe the design of a factorial experiment.
• Two-factor experiment


  The simplest factorial design, having two independent variables.