The extent to which products meet specifications needs to be systematically monitored in a production process. Product quality will typically be defined by two quantities: deviations from stated ...

2 types of variation and how we distinguish between common and special cause variation, along with how to create a rational subgroup. We also cover the equations and constants for the X-bar and R ...

The cumulative sum chart for controlling the mean of a manufacturing process having normally distributed quality with known variance is studied. The costs of repairing the process, of operating out-of ...