When the $\bar { x }$ control chart shows a change in the mean of the process distribution,the result is referred to as:
A) a trend.
B) a cycle.
C) a level shift.
D) instability.

Question

Quizplus · Accepted Answer

A change in the mean of the process distribution on the $\bar { x }$ control chart is referred to as a level shift. A trend is a gradual shift in the process mean over time, a cycle is a repeatable pattern in the data, and instability refers to random variation or lack of control in the process.

When The xˉ\bar { x }xˉ Control Chart Shows a Change in the Mean of the Change

When The $\bar { x }$ Control Chart Shows a Change in the Mean of the Change