Question: A control chart X based on subgroups of size n = 4 and three sigma limits, It is used to monitor the mean of a

A control chart X based on subgroups of size n = 4 and three sigma limits, It is used to monitor the mean of a certain quality characteristic. In Phase II the control limits of the chart are LCS = 30.26 and LCI = 26.34. 1. What percentage of false alarms do you expect to get?

A control chart X based on subgroups of size n = 4 and three sigma limits, It is used to monitor the mean of a certain quality characteristic. In Phase II the control limits of the chart are LCS = 30.26 and LCI = 26.34. 1. What percentage of false alarms do you expect to get? 2. The product specifications are known to be 20 and 36. What is the value? of the Cp index? What can you conclude about the capacity of the process? 3. You want to build an R chart to monitor the variability of the process. What is the center line and upper control limit of this card?

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