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extraneous variables: age, gender, mood, behavior, ethnical differences, and discrimination.

What is a extraneous variable? Can you give me an example of this?

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"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 ...

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Extraneous variables are exemplified.