The lower control limit for the $\bar { x }$ ,p,and R charts must be zero or above.

Name: The lower control limit for the $\bar { x }$ ,p,and R charts must be zero or above.
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Question

Quizplus · Accepted Answer

This is true for all control charts. The lower control limit is calculated as the centerline minus 3 times the standard deviation (for $\bar { x }$ and R charts) or the centerline minus 3 times the standard error (for p charts), and cannot be negative. If the calculated lower control limit is negative, it is adjusted to zero.

The Lower Control Limit for The xˉ\bar { x }xˉ ,P,and R Charts Must Be Zero or Above

The Lower Control Limit for The $\bar { x }$ ,P,and R Charts Must Be Zero or Above