6) Explain the difference between control limits and specification limits of a process and how they are determined? (10 points) 7) Describe the general steps that must be carried out to execute a design of experiment (DOE), consider that we want to make a paper airplane fly as far as possible and we want to include as suspect X the width of the airplane, the length of the plane and the material with which the plane is built. (10 points) 8) What is the reason we always recommend initially including center points in a DOE's data collection plan? (10 points)