Variables, other than the manipulated variable, that affect the response of test units is called extraneous variables.

Name: Variables, other than the manipulated variable, that affect the response of test units is called extraneous variables.
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Extraneous variables are factors that can influence the response of test units, in addition to the manipulated variable. These variables need to be controlled in order to draw accurate conclusions from the experiment.

Variables, Other Than the Manipulated Variable, That Affect the Response