When estimating the natural, or inherent, process uniformity, two forms of varia

Question

When estimating the natural, or inherent, process uniformity, two forms of variability need to be quantified. These are Variability about an value. Variability of an average value from a desired value. In the absence of a specification on a continuous quality characteristic of interest in a capability study, the process capability be expressed in terms of the "natural process limits." The formula for those limits is When using a histogram to provide estimates of the mean and standard deviation for use in a process capability analysis, what is the formula for estimating the standard deviation? On a normal probability plot, to be able to conclude that the data can be modeled with the normal distribution, the plotted data must pass the test.

Explanation / Answer

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11)

SIGMA = sigma / srqt (n)

12)

Z test

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