11.17. The rotatable central composite design. It can be shown that a second-order design is rotatable if

11.17. The rotatable central composite design. It can be

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shown that a second-order design is rotatable if a b x = 0, ju if a or b (or both) are odd, and if x = 3xx Show that for the central composite design these conditions lead to a= (n) 1/4 for rotatability, where n is the number of points in the factorial portion.