Question

The Plackett-Burman method allows the investigation of ________ variables by _____ experiments.

(a) x-2, x

(b) x-1, x

(c) x, x-1

(d) x, x-2

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Answer 1

Correct option is (b) x-1, x

Best explanation: The Plackett-Burman method allows the investigation of x-1 variables by x experiments, where x must be the multiple of 4. Suppose there are 11 experiments then it allows 10 variables to be assessed.