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Which control charts will be useful if the process output data for the process capability study are collected in different time periods?

Which control charts will be useful if the process output data for the process capability study are collected in different time periods? Correct Answer x & R Charts

As variable control charts are capable of determining the process capability of both types, i.e. the instantaneous variability, and the variability across time, they are used, when the data for process capability analysis is collected in different shifts.

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