If a process has subgroups for Variable data and the process runs for a long period of time, then the best pair of SPC Charts to use would be an Xbar and _________.

Question

Quizplus · Accepted Answer

Xbar and R charts are the best pair of SPC charts to use for processes that have subgroups for variable data and run for a long period of time. The R chart is used to monitor the variability within each subgroup, while the Xbar chart is used to monitor the process mean. Together, these charts provide a comprehensive view of the process performance over time. The Individuals Chart (B) is more appropriate for short-term processes or when subgroups are not possible. The NP Chart (A) is used for attribute data, not variable data. The C Chart (D) is used for count data, not variable data.

If a Process Has Subgroups for Variable Data and the Process