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What should be the ideal standard deviation for a process?
For a process, the ideal SD is 0.
What do the letters mean in the acronym DMAIC?
D Define a problem or improvement opportunity.M Measure process performance.A Analyze the process to determine the root causes of poor performance; determine whether the process can be improved or should be redesigned.I Improve the process by attacking root causes.C Control the improved process to hold the gains.
What is the definition of the stochastic process?
The definition to the term "Stochastic Process" is: A statistical process involving a number of random variables depending on a number variable. Which in most cases, is time.
What is the definition of Cp and Cpk in Statistical process control?
Cp is the capability of a process and Cpk is the actual capability of a part running in the process. The only way Cp = Cpk is if the process mean is exactly centered which is seldom the case in manufacturing. Therefore, Cp > or = to Cpk.
What is the benefit of knowing 3 standard deviations above and below the mean of data from a process?
If the process can be assumed to follow a Gaussian distribution then 99.7% of the outputs of the process will lie between those two limits. That may be of benefit in quality control if it is a production process.
