How many interactions do we need to investigate for a 2 x 2 x 2 factorial design? Select one: a. Two b. Six c. Three d. Twelve e. Four
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The number of two-way interactions is given by $\binom{3}{2} = \frac{3!}{2!1!} = \frac{3 \times 2 \times 1}{(2 \times 1)(1)} = 3$. Show more…
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