Question: To construct an x bar chart for a process you have collected 10 samples from the process outputs with 7 observations in each sample and

  1. To construct an x bar chart for a process you have collected 10 samples from the process outputs with 7 observations in each sample and found that the average of the sample mean is 20 and the average of the sample ranges is What should be the upper control limit of the x bar chart.
  2. If the process capability index it means the process is capable of producing at four sigma quality

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