Question: If product specifications (Us and LS) and process mean remain unchanged, as the sigma capability (Sigma capability can be computed by S = min[( US

If product specifications (Us and LS) and process mean remain unchanged, as the sigma capability (Sigma capability can be computed by S = min[(US - )/, (-- LS)/ ]) of a process improves from being a S=1 (or 1-sigma capability) process to a S=4 process,

(a) what is the effect on the range between the control limits (UCL LCL)? Does it become narrower, wider, or remain unchanged?

(b) Why?

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