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## Statistical Process Control

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**Overview**• Definition of Statistical Process Control • Common causes and assignable causes of variation • Control charts • Type I and Type II Errors • R, x, p, and c charts • Process Distribution**Definition of SPC**Statistical process control (SPC) is the application of statistical techniques to determine whether the output of a process conforms to the product or service design.**Common causes of variation**Process Distribution for the Box-Filling Machine When Only Common Causes of Variation Are Present**R-chart**A range chart, or R-chart, is used to monitor process variability.**x-Charts**An x-chart (read " x-bar chart") is used to measure the mean.**p-Charts**The p-chart is a commonly used control chart for attributes.**c-Charts**When management is interested in reducing the number of defects per unit, another type of control chart, the c-chart, is useful.**Conclusion**• Definition of Statistical Process Control • Common causes and assignable causes of variation • Control charts • Type I and Type II Errors • R, x, p, and c charts • Process Distribution • = Quality Control and Lower Costs