An extraneous variable can become a confounding variable if it is allowed to change systematically along with the two other variables being examined in a research study.

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Quizplus · Accepted Answer

This is true. An extraneous variable is a variable that is not being studied but could affect the outcome of the research. If it changes systematically along with the two variables being studied, it becomes a confounding variable and can affect the relationship between the two variables of interest.

An Extraneous Variable Can Become a Confounding Variable If It