What is a Standard Deviation Control Chart (S-Chart)?
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What is a Standard Deviation Chart?
The Standard Deviation or S-Chart is used together with the X-bar chart to evaluate process variation. The S chart must show stability before analyzing the X-bar chart. The S control chart is appropriate for assessing within subgroup variation when the size of the subgroups is larger than eight (8). The centerline for the S chart is the average of all standard deviations. The control limits are placed ±3 standard deviations from the average.
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