Confounded Variables:
A confound occurs when you select an IV and another variable varies with it. What then is the cause of the effect on the DV? Is it the IV or the confound?

Example:

• The Study: The Effects of Race on Guilty/Not Guilty Decisions in Jury Trials for DWI (Drinking While Intoxicated).
• Your Hypothesis: People will more easily vote to convict people of different races.
• Method: Set up mock trials with juries and defendants of similar or varying races.

What might be a confound in this study? What other factor might vary with race that could influence whether juries vote to convict or not?