**Extraneous and Confounding Variables and Systematic vs Non ...**
https://resources.saylor.org/wwwresources/archived/site/wp-content/uploads/2011/08/PSYCH202A-5.3.1-Extraneous-and-Confounding-Variables-and-Systematic-vs-Non1.pdf

Extraneous and Confounding Variables and Systematic vs Non-Systematic Error Extraneous Variables are undesirable variables that influence the relationship between the variables that an experimenter is examining. Another way to think of this, is that these are variables the influence the outcome of an experiment, though they are not the variables that are actually of interest.

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