Which of the control charts must have at least 20 subgroups of observed values to judge whether a process is in control or not?

The correct answer is A. R-Chart. An R-chart contains data gathered at regular intervals. It measures the sample range over time which is a measure of dispersion. The R-chart must have at least 20 subgroups of observed values with each subgroup containing 3 to 6 observations. With these minimum number of…

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Question

Options

AR-Chart
BP-Chart
CC-Chart
DY-Chart

How the community answered

(49 responses)

A
76% (37)
B
4% (2)
C
14% (7)
D
6% (3)

Explanation

An R-chart contains data gathered at regular intervals. It measures the sample range over time which is a measure of dispersion. The R-chart must have at least 20 subgroups of observed values with each subgroup containing 3 to 6 observations. With these minimum number of observations, it is convenient to observe whether the variation falls within the upper and lower

Topics

#R-chart#control charts#subgroup requirements#statistical process control

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