The upper control limitUCL is defined as:
a. the lowest point established as the bottom specification on a control chart. LCL X-bar = Average X-bar – (A2 X Average R).
b. a term used on a Table designed to identify factors for Range control limits.
c. are boundaries that tell you if the process is in control.
d. the highest point established as the top specification on a control chart. UCL X-bar = Average X-bar + (A2 X Average R).
Answer: D
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