For a control chart, where are the lower and upper control limits usually set?
A) one standard deviation from the centreline
B) two standard deviations from the centreline
C) three standard deviations from the centreline
D) four standard deviations from the centreline

Question

For a  control chart, where are the lower and upper control limits usually set?
A) one standard deviation from the centreline 
B) two standard deviations from the centreline 
C) three standard deviations from the centreline 
D) four standard deviations from the centreline

Quizplus · Accepted Answer

The lower and upper control limits on a 11eab386_b93c_a44a_aec0_6fd64653c83e_TB4962_11 control chart are usually set at three standard deviations from the centerline. This allows for 99.7% of the data to fall within the control limits if the process is in control.

For a Control Chart, Where Are the Lower and Upper