Use Xbar-S Chart to monitor the mean and variation of a process when you have continuous data and subgroup sizes of 9 or more. Use this control chart to monitor process stability over time so that you can identify and correct instabilities in a process.
For example, a paint manufacturer wants to assess the stability of its filling process for cans of paints. Operators collect subgroups of 10 cans every hour for 30 hours and use an Xbar-S chart to monitor the mean and variation of the filled paint cans.
Where to find this control chart
To create an Xbar-S chart, choose Stat > Control Charts > Variables Charts for Subgroups > Xbar-S.