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

Question

Quizplus · Accepted Answer

Changing from three-sigma limits to two-sigma limits makes the control chart more sensitive, increasing the likelihood of detecting a signal (or variation) that is actually due to random chance, leading to more false alarms and unnecessary searches for causes.

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