What is an Extraneous Variable? (with pictures)
https://www.wisegeek.com/what-is-an-extraneous-variable.htm
An extraneous variable is an independent variable that may add noise to an experiment or bias the results, disrupting the effect that the chosen independent variable has on the dependent variable. In scientific experiments, the things that variables are highly controlled, but in the softer sciences, such as experimental psychology, it is more difficult to separate those characteristics that ...
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