The use of a control chart assumes that random errors are normally distributed about a mean of zero.

Question

Quizplus · Accepted Answer

Control charts are based on the assumption that the process variation follows a normal distribution, where random errors or natural variations in the process are symmetrically distributed about a mean, which is ideally zero for the error term. This allows for the monitoring of process stability and the detection of out-of-control conditions.

The Use of a Control Chart Assumes That Random Errors