X-Charts

Abstract

Figure 11.5 Shewhart’s Big Question Answered shows that you need statistical guidelines to help identify when special causes are present. Control charts are used to show you these guidelines. In this chapter, you will learn about a particular control chart called an x-chart that will indicate whether the process is in control or not in control. I will not go into the math of x-charts. Instead I will give you links to computer spreadsheets that do the math for you.