Question: Problem 4: Control charts for xx and s are maintained on a quality characteristic. The sample size is n=4. After 30 samples, we obtain i=130xi=12,870andi=130si=410

Problem 4: Control charts for xx and s are maintained on a quality characteristic. The sample size is n=4. After 30 samples, we obtain i=130xi=12,870andi=130si=410 a. Find the three-sigma limits for the s chart. b. Assuming that both charts exhibit control, estimate the parameters and

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