Question: 2 1 . When do we revise control limits and center lines? a . At regular intervals. b . Target value may be center line,

21. When do we revise control limits and center lines?
a. At regular intervals.
b. Target value may be center line, it R chart exhibits control.
c. R chart out of control, remove special causes, then revise.
d. Need a minimum of 25 subgroups.
e. All of the above

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