I have two questions: 1. What if you have a value beyond 3SD during the 20 measurements of running IQC? I mean why we run the IQC on a system whose reliability may affect the generation of +-2SD? 2. After running the IQC for 20 days, and getting Mean and SDs, when we make this chart, and then enter new values of controls, will the chart not be affected?
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