When the control chart shows a slow and steady shift (up or down)in the process distribution mean,the result is referred to as:
A)a level shift.
B)a cycle.
C)a trend.
D)instability.

Question

When the  control chart shows a slow and steady shift (up or down)in the process distribution mean,the result is referred to as:
A)a level shift. 
B)a cycle. 
C)a trend. 
D)instability.

Quizplus · Accepted Answer

A slow and steady shift in the process distribution mean is referred to as a trend. This is because there is a gradual change in the process over time, which can be observed by plotting data on a control chart. A level shift is a sudden change in the process mean, while a cycle is a pattern of behavior that repeats itself at regular intervals. Instability refers to a situation where the process is not in statistical control, and there is a lot of variation in the data. None of these terms describe a slow and steady shift in the process distribution mean.

When the Control Chart Shows a Slow and Steady