Question: When should the formula sigma hat =Sbar / c4 be used to calculate estimated standard deviation ? A. When the Xbar and S charts were

When should the formula sigma hat =Sbar / c4 be used to calculate estimated standard deviation ? A. When the Xbar and S charts were used to establish process stability. B. When the Xbar and MR charts were used to establish process stability. C. When the p and np charts were used to establish process stability. D. When Xbar and R charts were used to establish process stability

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When should the formula sigma hat =Sbar / c4 be used to calculate estimated standard deviation

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