When the 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

When the  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.

Quizplus · Accepted Answer

A change in the mean of the process distribution on a control chart is referred to as a level shift. This means that there has been a significant change in the average value of the output being produced by the process, which can indicate a shift in the underlying process or a change in the inputs. A trend refers to a gradual shift in the process mean over time, while a cycle refers to a repeating pattern in the data. Instability is a more general term that can refer to any type of variation or deviation from the expected behavior of the process.

When the Control Chart Shows a Change in the Mean