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

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

(a) Find the three-sigma limits for the s chart.
(b) Assuming that both charts exhibit control, estimate the parameters µ and σ.

x, = 12,870 and = 410

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