If a company is using an $\overline { \mathcal { X } }$
chart for a given process with measurement data,it is generally not important or necessary to use an R chart or s chart.

Question

If a company is using an $\overline { \mathcal { X } }$ 
chart for a given process with measurement data,it is generally not important or necessary to use an R chart or s chart.

Quizplus · Accepted Answer

While an $\overline { \mathcal { X } }$ chart can be used to monitor the centering of a process, it does not provide information on the variability of the process. Therefore, it may be important or necessary to use either an R chart or s chart to monitor the process variability.

If a Company Is Using An X‾\overline { \mathcal { X } }X

If a Company Is Using An $\overline { \mathcal { X } }$