Sources of variation which are non-random (Special Cause)?

Question

could anybody answer the question, it is related to statistcs

Answer 1

Hi. Sure. Suppose Phil runs a machine to make widgets. He is good and consistent and always tries to make a nominal part. Phil is out sick one day and Zack runs the widget machine for a day. Zack plays it safe and always makes widgets that are near the high side on the tolerance. A measurement of the process will show a shift that needs to be explained. Zack vs Phil.