The Bottle sample data contains simulated data from a bottle top manufacturing process. Sample is the sample ID number for each bottle. Status indicates whether the bottle top conformed to the design standards. In the Phase column, the first phase represents the time before the process adjustment. The second phase represents the time after the process adjustment. Notes on changes in the process are also included.
Select Help > Sample Data Library and open Quality Control/Bottle
Select Analyze > Quality and Process > Control Chart Builder.
Drag Sample to the Subgroup role.
Drag Status to the Y role.
np-chart of Status (Nonconforming)
Drag Phase to the Phase zone.
np-chart by Phase
Including the Phase variable means that the control limits for phase 2 are based only on the data for phase 2. None of the phase 2 observations are outside the control limits. Therefore, you can conclude that the process is in control after the adjustment.

Help created on 9/19/2017