Question: The upper and lower control limits are usually set at: a. +/- 1 sigma b. +/- 2 sigma c. +/- 3 sigma d. +/- 6
The upper and lower control limits are usually set at:
a. +/- 1 sigma
b. +/- 2 sigma
c. +/- 3 sigma
d. +/- 6 sigma
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