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
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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
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When dealing with variable data and subgroups in a long-running process, the best pair of SPC charts to use are the Xbar Chart and R Chart. The Xbar Chart monitors the process mean over time using the averages of subgroups, while the R Chart monitors the range, or dispersion, within those subgroups. Other options like NP Chart, Individuals Chart, and C Chart are not suitable because NP and C charts are used for attribute data, while the Individuals Chart is used for data that comes in single, individual measurements rather than in subgroups.
A. NP Chart is for attribute data and not for variable data. B. Individual Chart is used for variable data but only when you have just 1 subgroup. D. C Chart is used for attribute data and not for variable data. C. R chart is the only option in the list that can be used with variable data and when you have more than 1 subgroup. If you read carefully, the question says "If a process has subgroups".