Physical Variables When an Extraneous Variable Systematically Changes Across Treatments

question 21

Multiple Choice

Physical Variables When an extraneous variable systematically changes across treatments,

• A)the extraneous variable has the same value in the control and experimental conditions.
• B)the extraneous variable has one value in the control condition and a different value in the experimental condition.
• C)the independent variable has no effect on the dependent variable.
• D)this presents a lower risk of confounding than when it changes randomly.

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