Which is not the effective way of controlling a nuisance variable in a experimental design? [3009]

Q) Which is not the effective way of controlling a nuisance variable in a experimental design?

Options:
A)Excluding the variable as one of the factors in the experiment
B) Exercising statistical control
C) Random assignment of subjects
D) Holding the nuisance variable constant for all subjects.

Answer

C) Random assignment of subjects

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