ESE 2025Q48
Q: Which one of the following is the correct UCL for central limits of non-conforming units with constant or variable sample size in control charts for attributes?
(a)P̄ + 3√[ P̄(1 − P̄) / n ]
(b)np + 3√[ np(1 − p̄) ]
(c)c̄ + 3√c̄
(d)ū + 3√( ū / n )
Correct Answer: (b)
Detailed explanation coming soon.