What type of experiment is typically used to estimate the parameters of the model: y-bg +bqX1 + b2x2+b12X1X2+b3xj+box? OOO A experiment where all combinations of the process variables x; and Xz are considered but when X and XZ have just two different values. Traditional experimentation, where process variables x; and X2 take on just 2 different values. None of the shown options A structured experiment where process variables x, and X2 take on at least 3 different values