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 Take a quick matching test 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.


  • Short web  tutorial (works well with the book).
  • This PowerPoint tutorial will help you understand interactions--without math.
  • Download this thorough tutorial. It is long, but you will be a master at interpreting 2 X 2 designs once you are done. If you want to learn in smaller bites, download the following three tutorials:

        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 the first part of the chapter.
    • Take 9-item quizzes over the second part of the chapter.
    • Take 6-item quizzes over the third part of the chapter.
    • Take 7-item quizzes over the fourth part of the chapter.
    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.

    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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