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Statistical Process Control

Statistical Process Control. 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.

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Statistical Process Control

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  1. Statistical Process Control

  2. 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

  3. 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.

  4. Common causes of variation Process Distribution for the Box-Filling Machine When Only Common Causes of Variation Are Present

  5. Assignable causes of variation

  6. Effects of Assignable Causes

  7. Control Charts - Examples

  8. Type I and Type II Errors

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

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

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

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

  13. Process Distribution

  14. 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

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