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What does usage of s instead of R/d2 in the confidence intervals indicate?

What does usage of s instead of R/d2 in the confidence intervals indicate? Correct Answer Process must be in control

When process is not in control, the value of s has a big difference with the value of R/d2. So for the calculation of confidence interval s is used. This means, for a PCR to have a meaning, the process must be in control.

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Select the correct answer:
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