np chart
An np chart examines changes in the number of nonconforming units at a constant sample size.
Other learning contexts (3)
In context
It applies when each product is counted by whether it is nonconforming; a constant sample size is an important condition.
Example
Consider a case in which exactly 100 items are inspected each hour and nonconforming units are counted.
Key distinction
Do not apply the same count criterion when inspection quantities vary.
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