• http://gateway1.gmcc.ab.ca/~digdonn/psych104/think.htm
  This site has an exercise designed to acquaint students with the basics of experimental design.
  

• http://trochim.human.cornell.edu/tutorial/abrahams/sbk16.htm
  This site discusses the One-Group Before-After and Static Group Design which in the Christensen textbook is labeled the Nonequivalent Posttest-Only Design.
  

• http://trochim.human.cornell.edu/tutorial/belue/belue.htm
  This site provides a tutorial on how to choose a research design.
  

• http://trochim.human.cornell.edu/kb/desexper.htm
  This site discusses the characteristics of good experimental designs with links to discussions of various true experimental designs from two-group to factorial designs.
  

• http://davidmlane.com/hyperstat/factorial_ANOVA.html
  This site gives links to sites that discuss issues such as factorial designs, main effects, and interactions.
  

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