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. is used to indicate gains or losses in dispersion.
D. 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.
The R-chart A. control limits are computed using sample standard deviations.

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