In some cases,the -chart is used without an R-chart because there is no variation between the samples.

Question

In some cases,the  -chart is used without an R-chart because there is no variation between the samples.

Quizplus · Accepted Answer

The 11eac5d1_2911_2ed9_888f_e9b7348f9dff_TB7749_11-chart and R-chart are usually used together in control charts. The 11eac5d1_2911_2ed9_888f_e9b7348f9dff_TB7749_11-chart is used to monitor shifts in the process mean, while the R-chart is used to monitor the process variability. Even if there is no variation between the samples, the R-chart is still necessary to ensure that the process is stable and the lack of variation is not a result of measurement error or other factors.

In Some Cases,the -Chart Is Used Without an R-Chart