If Minitab plots the upper and lower control limits (UCL and LCL) three standard deviations above and below the mean, why are the limits plotted at values other than 3 times the standard deviation that I get using Stat > Basic Statistics? If you compare the charts in Figure 7 with the charts in Figure 2 shown earlier on this page, you will find that the charts within Figure 7 provide a more pronounced contrast for the data.Users often contact Minitab technical support to ask how the software calculates the control limits on control charts.Ī frequently asked question is how the control limits are calculated on an I-MR Chart or Individuals Chart.
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