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Hi this is Tami, I have a question for you. It is obvious to myself that I'm having trouble with confounding variables and know I'm probably thinking to deeply on identifying them, the same goes with the next section on designing experiments. Is there some way to make identifing them better? The triangle thing helps looking to look at it differently.

Hi Tami,

I found a couple of Web sites that might help with other examples.

• Confounding Variables by SCORE Mathematics (score.kings.k12.ca.us/lessons/wwwstats/confounding.variables.html)
• Confounding Variables by the Research Methods Team, School of Community, Health Sciences and Social Care, University of Salford, UK (www.chssc.salford.ac.uk/healthSci/resmeth2000/resmeth/confvars.htm)
• Chapter 2: Simpson's Paradox by the Pearson Education Web Publishing System (wps.aw.com/wps/media/objects/15/15719/projects/ch2_simpson/)

Please feel free to ask about this more in class, or to visit office hours. And please let me know if you have any other questions.

Statistically yours,

Tom Short
tshort@iup.edu

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