To set $\bar { X }$ -chart upper and lower control limits, one must know the process central line, which is the
A) average of the sample means
B) total number of defects in the population
C) percent defects in the population
D) size of the population
E) average range

Question

Quizplus · Accepted Answer

The process central line on an $\bar { X }$ -chart, which is used in statistical process control to monitor the mean of a process, is determined by the average of the sample means. This provides a baseline from which to measure process variation.

To Set Xˉ\bar { X }Xˉ -Chart Upper and Lower Control Limits, One Must Know the Control

To Set $\bar { X }$ -Chart Upper and Lower Control Limits, One Must Know the Control