Open, found in the Quality Control sample data folder. This data set contains the diameters taken for each day, both with the first prototype (phase 1) and the second prototype (phase 2).
Select Help > Sample Data Library and open Quality Control/
Select Analyze > Quality and Process > Control Chart > XBar.
Select DIAMETER and click Process.
Select DAY and click Sample Label.
Select Phase and click Phase.
Select S and XBar.
Phase Control Chart

Help created on 9/19/2017