The general practice in quality control is to set the control chart's upper and lower control limit values equal to the variable's mean value +/- _____.
A) 1 standard deviation
B) 2 standard deviations
C) 2.5 standard deviations
D) 3 standard deviations

Question

Quizplus · Accepted Answer

The common practice in quality control for setting the control chart's upper and lower control limits is to use the mean value +/- 3 standard deviations. This approach helps in identifying significant process variation or out-of-control conditions.

The General Practice in Quality Control Is to Set the Control