The primary advantages of a factorial design over simpler experiments are that a researcher can be more efficient in testing the effects of multiple independent variables in one experiment and can also examine the combined effects of those independent variables on the dependent variable.

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This statement is true. Factorial designs allow researchers to test the effects of multiple independent variables in one experiment and also examine the combined effects of those independent variables on the dependent variable. This can increase the efficiency and effectiveness of the study.

The Primary Advantages of a Factorial Design Over Simpler Experiments