To run a Control Charts analysis, from the menus choose:
Graphs
Control...
Click Define.
Select pH level as the
process measurement variable.
Select Time of measurement as the
subgroup definition variable.
Click Statistics.
Type 5.5 as the
upper specification limit (USL).
Type 4.5 as the
lower specification limit (LSL).
Type 5.0 as the
target.
Select CP,
CpU,
CpL,
K,
CpM, and
Z-out in the
Process Capability Indices group.
Select PP,
PpU,
PpL,
PpM, and
Z-out in the
Process Performance Indices group.
Select Actual % outside specification limits.
Click Continue.
Click OK in the
X-Bar, R, s: Cases are Units dialog box.
These selections produce a Range chart, X-bar chart, and process statistics table.