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

In quality control, control charts typically set the upper and lower control limits at the mean plus and minus 3 standard deviations to capture the majority of data points under a normal distribution.

The General Practice in Quality Control Is to Set the Control