step  To run a control charts analysis, from the menus choose:

Graphs
  Control...

step  Click Define.

step  Select pH level as the process measurement variable.

step  Select Time of measurement as the subgroup definition variable.

step  Click Statistics.

step  Type 5.5 as the upper specification limit (USL).

step  Type 4.5 as the lower specification limit (LSL).

step  Type 5.0 as the target value.

step  Select CP, CpU, CpL, K, CpM, and Z-out in the Process Capability Indices group.

step  Select PP, PpU, PpL, PpM, and Z-out in the Process Performance Indices group.

step  Select Actual % outside specification limits.

step  Click Continue.

step  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.