Statistical Process Control

Statistical Process Control

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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

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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.

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Common causes of variation Process Distribution for the Box- Fil ing Machine When Only Common Causes of Variation Are Present

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Assignable causes of variation

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Effects of Assignable Causes

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Control Charts – Examples

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Type I and Type II Errors

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R-chart A range chart, or R-chart, is used to monitor process variability.

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x-Charts An x-chart (read " x-bar chart") is used to measure the mean.

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p-Charts The p-chart is a commonly used control chart for attributes.

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c-Charts When management is interested in reducing the number of defects per unit, another type of control chart, the c-chart, is useful.

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Process Distribution

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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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