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In the Plackett-Burman method, the evaluation of x-1 variables by x experiments, where x must be the multiple of?

In the Plackett-Burman method, the evaluation of x-1 variables by x experiments, where x must be the multiple of? Correct Answer 4

The Plackett-Burman method allows for the evaluation of x-1 variables by x experiments, x must be a multiple of 4, e.g. 8, 12, 16, 20, 24, etc. Normally one determines how many experimental variables need to be included in an investigation and then selects the Plackett-Burman design which meets that requirement most closely in multiples of 4.

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