Regarding Control Charts, Changing from Two-Sigma Limits to Three-Sigma Limits

question 48

Multiple Choice

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

• A) increases the probability of concluding nothing has changed, when in fact it has.
• B) increases the probability of searching for a cause when none exists.
• C) decreases the probability that the process average will change.
• D) decreases the probability that defects will be generated by the process.