| Key: |
| UCL = Upper Control Limit |
| LCL = Lower Control Limit |
 = Mean (average of all
the  values (subgroup averages)) |
Click over the out of control point indicating the presence of a special cause on the graph below.
| Key: |
| UCL = Upper Control Limit |
| LCL = Lower Control Limit |
| = Mean (average of all
the values (subgroup averages)) |