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The UCL and LCL for an -Chart Are 25

question 122

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The UCL and LCL for an The UCL and LCL for an   -chart are 25 and 15 respectively.The central line is 20,and the process variability is considered to be in statistical control.The results of the next six sample means are 18,23,17,21,24,and 16.What should you do? A) Nothing;the process is in control. B) Explore the assignable causes because the second and fifth samples are above the mean. C) Explore the assignable causes because there is a run. D) Explore the assignable causes because there is a trend. -chart are 25 and 15 respectively.The central line is 20,and the process variability is considered to be in statistical control.The results of the next six sample means are 18,23,17,21,24,and 16.What should you do?


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