[Solved] Which statement is true of an experiment of factorial design?

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Q.	Which statement is true of an experiment of factorial design?
A.	Independence or orthogonality is unaffected by the sizes of the participant samples in the various treatment combinations.
B.	There are always at least two control groups.
C.	Control over an independent variable is achieved by orthogonal variation with respect to the other independent variables.
D.	There is always a single control group.
Answer» C. Control over an independent variable is achieved by orthogonal variation with respect to the other independent variables.

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