Question: The R - chart A . control limits are computed using sample standard deviations. B . is used to measure changes in the central tendency.

The R-chart
A. control limits are computed using sample standard deviations.
B. is used to measure changes in the central tendency.
C. generally uses control limits set at plus or minus 2 standard deviations of the distribution, rather than plus or minus 3, which is commonly used on the x-bar chart.
D. is used to indicate gains or losses in dispersion.
The R-chart A. control limits are computed using sample standard deviations.

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