Marc: I second Marie's suggestion here. I use Stanovich in a required Scientific Foundations class for Psych students and we spend time on differentiating this issue of the internal validity and logic of experimental design versus the place of external validity. At the same time, it is a good place to clarify the role of random assignment in between-group studies versus random sampling in survey research. Hopefully, this helps them when they get to our Research Methods class. I also use an ESP test with two trials and have them develop ways to test me. Gary
Gerald L. (Gary) Peterson, Ph.D. Professor, Psychology Saginaw Valley State University University Center, MI 48710 989-964-4491 [EMAIL PROTECTED] ---
