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The R​-chart
A. is used to indicate gains or losses in uniformity.
B. 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.
C. control limits are computed using sample standard deviations.
D. is used to measure changes in the central tendency.

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sandlee09

Answer:

A.

Step-by-step explanation:

An R-Chart is a control chart used to indicate the changes in a variable usually  with processes that have subgroup size of 2 or higher. Based on the answers provided within the question, it can be said that the R-chart is used to indicate gains or losses in uniformity, which would be the changes in the variable. This can be demonstrated in the R-chart below.

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