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More inspections and fewer inspections both produce more errors.
Inspection occasionally rejects a good item or fails to identify a defective item. A false positive has little consequence other than the cost of replacing the item. But a false negative can have great consequence, as the item may fail after being placed in service.
More inspections are not necessarily the answer, however. Statistically, the addition of an infinite number of inspections will cause nearly every item to be found defective for some reason. An optimal level of inspection balances the economics of replacing false positives with the human and moral consequences of failing to detect real errors.
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