The following example uses the Coating.jmp data table. The quality characteristic of interest is the Weight column. A subgroup sample of four is chosen. An XBar-chart and an R-chart for the process are shown in Figure 3.17.
1.
Select Help > Sample Data Library and open Quality Control/Coating.jmp.
2.
Select Analyze > Quality and Process > Control Chart > XBar.
3.
Select Weight and click Process.
4.
Select Sample and click Sample Label.
5.
Note: If an S chart is chosen with the XBar-chart, then the limits for the XBar-chart are based on the standard deviation. Otherwise, the limits for the XBar-chart are based on the range.
Figure 3.17 Variables Charts for Coating Data
6.
Right-click in the XBar of Weight plot and select Chart Options > Box Plots.
Figure 3.18 Box Plots for Coating Data
The box plots in Figure 3.18 show that the sixth sample has a small range of high values.

Help created on 10/11/2018