To set -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

To set  -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

Quizplus · Accepted Answer

The process central line is typically determined by calculating the average of the sample means, which represents the average performance of the process. Once the central line is established, upper and lower control limits can be set based on the process variability. None of the other options provide information that is necessary for setting control limits.

To Set -Chart Upper and Lower Control Limits, One