Control Limits for Xbar-S chart

Hint: Use this chart to determine the Upper Control Limit (UCL) and Lower Control Limit (LCL) for an Xbar-S chart. Mean and Standard Deviation (Xbar-S) chart is used when you have Continuous data with a Sample Size of greater than eight

Grand Mean (x-bar-bar)
Calculate individual average of the observations for each time period. Then calculate the grand mean i.e average of averages
Average Standard Deviation
Calculate Standard Deviation of each time period. Then calculate the average standard deviation i.e average of all standard deviations
Sample Size (between 9 and 25)
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Lower Control Limit (LCL) for Sample Mean Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Upper Control Limit (UCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Lower Control Limit (LCL) for Sample Standard Deviation Chart
Control Limits Not Applicable
Control Limits cannot be calculated since a negative average standard deviation was entered. Enter a value greater than zero
Use Xbar-R Chart or I-MR Chart
Since the number of observations in each sub-group is less than nine, it is recommended to use a Xbar-R chart (if number of observations are between two to eight) or I-MR chart (if number of observation is one)
Incorrect number of observations
Please enter an integer between nine to twenty five

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