What type of experiement is typically used to estimate the parameters of the model? y = b0 +b1x1+b2x2+b12x1x2+b3x21+b4x22 1- traditional experimentation, process variables x1 and x2 take on just 2 different values. 2- structured experiement where variables x1 and x2 take on at least 3 different values 3- expereiment where all combinations of the process variables x 1 and x2 are considered but when x1 and x2 have only two different values

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