If the R-chart indicates that the process variation is in control, then it makes sense to construct and interpret the $\overline { \mathrm { X } }$ chart.

Question

Quizplus · Accepted Answer

If the R-chart shows that the process variation is stable and in control, it is appropriate to use the $\overline { \mathrm { X } }$ chart to monitor the process mean, as the assumption of stable variation is necessary for accurate interpretation of the $\overline { \mathrm { X } }$ chart.

If the R-Chart Indicates That the Process Variation Is in Control