In the empirical model: y=bo +bqXq+b2x2+b12X1X2+b3x2q+b4x22 what does the presence of a zero value for the parameter b3 allow for: None of the shown options. Changes in process variable x to change y by the same amounts irrespective of the value for x2 Changes in process variable x to change y by the same amounts irrespective of the value for x. Changes in process variable xq to change y by a different amount depending on the value for X1. Changes in process variable xy to change y in a non linear way