For Exercises 12.11 to 12.13, see page 612; for 12.14 and 12.15, see page 614; for 12.16 to 12.18, see page 619; and for 12.19 to 12.21, see pages 625–626.
12.11 Interpreting signals.
Explain the difference in the interpretation of a point falling beyond the upper control limit of the chart versus a point falling beyond the upper control limit of the chart.
12.11
A point falling beyond the upper control limit of the chart indicates a change in the process level; a point falling beyond the upper control limit of the chart indicates a change in variation.