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Consider a 2^3 factorial design lay out in 2 bocks,each of size 4, as follows Block I {1,a,b,c} Block II {ab,ac,bc,abc} Here,the treatments combinations are written in Yates’ notation.Then which of the following are always true? a) Main effect A is confounded b) Main effect B is unconfounded c) Interreaction AB,BC,AC are all unconfounded d) Interreaction ABC is confounded

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