# Question

Control charts for and s are maintained on a quality characteristic. The sample size is n = 4. After 30 samples, we obtain

(a) Find the three-sigma limits for the s chart.

(b) Assuming that both charts exhibit control, estimate the parameters µ and σ.

(a) Find the three-sigma limits for the s chart.

(b) Assuming that both charts exhibit control, estimate the parameters µ and σ.

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