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What is the value of LCL for the s chart when the standard value for σ is not given?

What is the value of LCL for the s chart when the standard value for σ is not given? Correct Answer B3 s

The LCL of the s chart gives the value equal to, B3 s when the standard value for σ is not given. This is the lowest the value of s can be, for the process to be in-control.

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