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# Statistics: Difference between two causes of variation

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Explain the difference between the two causes of variation, i.e. special or assignable cause and chance or common cause, and how they can be reduced.

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Explanation of the difference between the two causes of variation, i.e. special or assignable cause and chance or common cause, and how they can be reduced.

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The difference between the two causes of variation - special or assignable cause and chance or common cause - is that common cause is inherent to the process whereas special cause variation is assignable, in that it can be assigned specifically to a special event that can and should be corrected.

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