statistical process control. overview 1.definition of statistical process control 2.common causes...
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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-ChartsAn x-chart (read " x-bar chart") is used to measure the mean.
p-ChartsThe p-chart is a commonly used control chart for attributes.
c-ChartsWhen 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