Chapter 12: Factorial designs: Two independent variables

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10 Terms

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Factorial Designs

  • two or more independent variables (factors)

    • does age affect driving ability

    • does talking on a cell phone affect driving ability

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How do researchers study factorial designs

  • researchers cross the two independent variables; they study each possible combination of the independent variable

  • this is called a 2×2 factorial design; 2 levels of one independent variable are crossed with two levels of another independent variable

    • first IV has 2 levels (cell phone vs no cell phone)

    • second IV has 2 levels (older vs younger)

  • the combination of levels of the independent variables define all of the possible conditions of the study

<ul><li><p>researchers cross the two independent variables; they study each possible combination of the independent variable</p></li><li><p>this is called a 2×2 factorial design; 2 levels of one independent variable are crossed with two levels of another independent variable</p><ul><li><p>first IV has 2 levels (cell phone vs no cell phone)</p></li><li><p>second IV has 2 levels (older vs younger) </p></li></ul></li><li><p>the combination of levels of the independent variables define all of the possible conditions of the study</p></li></ul><p></p>
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main effects (factorial designs possible outcomes)

  • test each independent variable to look for main effects

  • overall effects of one independent variable on the dependent variable, averaging other levels of the other independent variable

  • simple difference

  • two independent variables, there are two main effects

  • is there an effect of cell phones use on driving regardless of the age of the driver

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main effects (interpreting from a table of means)

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