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Xbar S chart often used control chart to analyze the process mean and standarad deviation over time. This chart is used when the subgroup size is more than 10. The S chart provides a better understanding of the spread of data as compare to the range.

 

X bar S Control Chart definitions

 

X Bar: The mean varies in the process over time from subgroup values. The mean and standarda deviation is used to calculate the control limits.

 

S Chart: This represents the standard deviation of the process over time from mean of subgroups value. This monitors the process standard deviation.

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