If there is a chance of shifting of the process variability, which chart may be used with the modified control chart?

If there is a chance of shifting of the process variability, which chart may be used with the modified control chart? Correct Answer R-chart

As the process variability shifts can be monitored using a Shewhart R chart or an s-chart, if there is a chance of shifting of the process variability, they can be used in conjunction with modified control charts.

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