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Note on if a process is in or out of control

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How do you determine if a process is in or out of control and what is the significance of having appropriate significance levels (0.05, 0.01, 0.1, etc.)?

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This explains whether a process is in or out of control and what is the significance of having appropriate significance levels (0.05, 0.01, 0.1).

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The key to managing quality is to believe that excess variability is not inevitable. When the output of some process is found to be unreliable, not always confirming to the requirements, we must carefully examine the process and see how it can be controlled.

There are two kind of variations that are observed in the output from most processes, ...

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