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

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