___________________ is a difference between an observed event and a standard or norm. Without this standard, or, best practice, measurement of variation offers little beyond a description of the observations.

___________________ is a difference between an observed event and a standard or norm. Without this standard, or, best practice, measurement of variation offers little beyond a description of the observations.
A . Variation
B. Process variation
C. Assignable variation
D. Random variation

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Answer: A