Control limits are best described as:
a. the highest point established as the top specification on a control chart. UCL X-bar = Average X-bar + (A2 X Average R).
b. boundaries that tell you if the process is in control.
c. a cause of variation or special cause.
d. the lowest point established as the bottom specification on a control chart. LCL X-bar = Average X-bar – (A2 X Average R).
Answer: B
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