Question: Regarding control charts, changing from three-sigma limits to two-sigma limits: 1. increases the probability of concluding nothing has changed, when in fact it has. 2.

Regarding control charts, changing from three-sigma limits to two-sigma limits:

1. increases the probability of concluding nothing has changed, when in fact it has.

2. increases the probability of searching for a cause when none exists.

3. decreases the probability that the process average will change.

4. decreases the probability that defects will be generated by the process.

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