The following coded data represent the strength of a certain type of bread-wrapper stock produced under 16 different conditions, the latter representing two levels of each of four process variables. An operator effect was introduced into the model, since it was necessary to obtain half the experimental runs under operator 1 and half under operator 2. It. was felt that operators do have an effect, on the quality of the product.(a) Assuming that all interactions are negligible make significance tests for the factors A, B, C, and D Use a 0.05 level of significance(b) What interaction is confounded withoperators?

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Operator 1 Operator 2 a= 14.7 6=15.1 (1) = 18.8 ab = 16.5 %3D c = 14.7 abc = 19.0 ad = 16.9 bd= 17.5 ac = 17.8 bc = 17.3 d = 13.5 abd= 17.6 %3D %3D %3D acd = 18.5 bcd = 17.6 cd = 18.2 abcd = 20.1 %3D