Statistical Process Control. Overview 1.Definition of Statistical Process Control 2.Common causes and assignable causes of variation 3.Control charts.

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Presentation transcript:

Statistical Process Control

Overview 1.Definition of Statistical Process Control 2.Common causes and assignable causes of variation 3.Control charts 4.Type I and Type II Errors 5.R, x, p, and c charts 6.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

Assignable causes of variation

Effects of Assignable Causes

Control Charts - Examples

Type I and Type II Errors

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.

Process Distribution

Conclusion 1.Definition of Statistical Process Control 2.Common causes and assignable causes of variation 3.Control charts 4.Type I and Type II Errors 5.R, x, p, and c charts 6.Process Distribution = Quality Control and Lower Costs

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