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Normal
Although the distribution
of choice for a number of control charts using plotted averages, and the
most widely known distribution, it is not generally seen in practice as
the distribution of observations. To fit a normal distribution, only the
average and specified sigma (process, sample, or population) are needed.
Note that the curve generated will be used for K-S values and process capability,
but that process sigma is always used to define the distribution limits
on the Individual-X chart.
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