The following example uses the sample data table in the Quality Control sample data folder (taken from the ASTM Manual on Presentation of Data and Control Chart Analysis). The quality characteristic of interest is the Weight column. A subgroup sample of four is chosen.
Select Help > Sample Data Library and open Quality Control/
Select Analyze > Quality And Process > Control Chart > XBar.
Select Weight and click Process.
Select Sample and click Sample Label.
Variables Charts for Coating Data
An X-chart and an R-chart for the process are shown in Variables Charts for Coating Data. Sample six indicates that the process is not in statistical control. To check the sample values, click the sample six summary point on either control chart. The corresponding rows highlight in the data table.
Note: If an S chart is chosen with the X-chart, then the limits for the X-chart are based on the standard deviation. Otherwise, the limits for the X-chart are based on the range.

Help created on 9/19/2017