Chapter 12: Research Design Explained | Student Page

You are now at the Chapter 12 section of the book's student Web site.

Here you can

Get a slow, gentle introduction to the factorial experiment, and ...


Review and improve your understanding of the material Quiz yourself Apply this information Get help
Study this concept map to see the connections between key terms.

Review the concept of interaction by reading this mystery

Take a quick matching test

Review using our flashcards

Get a more in-depth understanding of interactions (especially ordinal and disordinal ones) by reading this Web Appendix. Get help answering the end-of-chapter exercises
If you are unsure about how to interpret a 2 X 2 factorial experiment, here are some  tutorials that should help.


  • Tutorial that provides a gentle introduction to factorial designs
  • Short web  tutorial (works well with the book).
  • This PowerPoint tutorial will help you understand interactions--without math.
  • Download these interactive Powerpoint tutorials. To use these programs, you  need to (1) have PowerPoint and (2) allow the programs to use macros. If you are having trouble enabling macros on your computer, and have a Mac, click here. If you have a Windows machine, click here.

        Introduction to factorial experiments, Part 1: Simple main effects

        Introduction to factorial experiments, Part 2: Main effects and interactions

        Introduction to factorial experiments, Part 3: Interpreting graphs of 2 X  2 experiments

  • Take the Practice Quiz (a short, general quiz over the entire chapter). Get a better idea of the steps involved in conducting a study by reading "Web Appendix: Conducting a Study."
    • Take 10-item quizzes over definitions of factorial designs, main effects, and interactions (the first part of the chapter).
    • Take 9-item quizzes over making sense of the results of a 2 X 2 experiment (the second part of the chapter).
    • Take 6-item quizzes over interpreting ordinal interactions (the third part of the chapter).
    For help seeing what a 2 X 2 table of means indicates in terms of main effects and interactions, click here.


    To convert a 2 X 2 table of means into a graph, click here.


    For help stating the predicted results of your proposed study in terms of main effects and interactions), click here.

    Get help calculating degrees of freedom for a factorial design.


    See what different factorial designs look like and how many participants they require

    Review by Test your skill at interpreting main effects and interactions. Do an ANOVA using a statistical calculator.

    Chapter 12 exercises


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