If the traditional 3-sigma limits on a control chart are replaced by 2-sigma limits,which of the following is TRUE?
A)Type I errors decrease.
B)Type I errors increase.
C)Type II errors increase.
D)The center line moves downward.

Question

Quizplus · Accepted Answer

Using 2-sigma limits instead of 3-sigma limits increases the likelihood of Type I errors, as the control limits are closer to the process mean, making it more likely to incorrectly signal that the process is out of control.

If the Traditional 3-Sigma Limits on a Control Chart Are