- You are now at the Chapter 12 section of the text's student Web site. Here you can
- Look over the concept map of the key terms and look at a glossary of the key terms.
- Test yourself on the chapter objectives.
- Test yourself on the key terms.
- Quick matching test
- Download a more challenging matching test

- Take the Practice Quiz (a short, general quiz over the entire chapter).
- Review by looking at the key issues and reading the chapter summary.

- Test your skill at interpreting main effects and interactions.
- Easiest version (examples include only main effects)
- Easy version
- Slightly more challenging version

- To get a better understanding of main effects and interactions (or for help
stating the results--or predicted results--of a study in terms of main effects
and interactions), click
here.
If you have an older computer, you may also download either the pre-Windows7 version or the System 9 Macintosh version of the Chapter 12 tutorial to practice

- Interpreting ANOVA tables and
- Interpreting graphs of the results of factorial experiments.

- If you are still unsure about how to interpret a 2 X 2 factorial experiment,
here are two short web tutorials that should help.
1. The authors' tutorial (works well with the book)

2. A well-respected tutorial that focuses on interactions--and gives you a certificate.

- 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

- Do an ANOVA using a statistical calculator.
- Get a better idea of the steps involved in conducting a study by reading "Web Appendix: Conducting a Study."
- Get a more in-depth understanding of interactions (especially ordinal and disordinal ones) by reading this Web Appendix.
- Get help calculating degrees of freedom for a factorial design
- Help with answering the end-of-chapter exercises