Confounding variable
MCAT glossary · Critical Analysis & Reasoning Skills
Definition
A third factor that influences both the independent and dependent variables, obscuring a causal interpretation.
Confounding variable in plain English
A confounding variable is a sneaky third thing that messes up your ability to say 'A caused B.' Say you notice that towns selling more ice cream also have more drownings — it looks like ice cream causes drowning, but really hot weather drives BOTH (more ice cream AND more swimming). Hot weather is the confounder: it's secretly linked to your suspected cause AND your outcome, so it fakes a connection that isn't really cause-and-effect. Scientists worry about confounders constantly, because missing one can make a totally false 'cause' look real.
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