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

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This statement is true. Extraneous variables can include environmental factors, individual differences among test units, and any other variable that may influence the response being measured in the experiment. These variables can potentially confound the results if they are not controlled or accounted for in the study design.

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