The lower control limit LCL is 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. the desired value ; also called the nominal value.
c. the lowest point established as the bottom specification on a control chart. LCL X-bar = Average X-bar – (A2 X Average R).
d. the number of samples that are averaged together to obtain a single data point.


Answer: C

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