Chapter 11: Statistical Processing Control

This chapter begins by describing the difference between accuracy and precision. It moves on to define some of the terms that are used in fundamental statistics through the use of an easy to understand example involving 10 giant gumballs. Based on the weights of these gumballs, the principles of standard deviations and confidence limits are introduced in a step-by-step manner. The topic then moves to drawing frequency distribution diagrams and using this information to determine how well a process is conforming to various standards such as package content weights or volumes. Two case studies are presented to further illustrate the applications of statistical processing control to real-life production situations.