A process is monitored using an x chart with ucl 138 and


Question: A process is monitored using an  X‾ ­ chart with UCL =­ 13.8 and LCL ­= 8.2. The process standard deviation is estimated to be 6.6. If the  X‾ ­ chart is based on three-sigma limits,

a. What is the estimate of the process mean?

b. What is the size of each of the sampling subgroups?

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Engineering Mathematics: A process is monitored using an x chart with ucl 138 and
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