A company believes a process monitored by an x-bar chart to be in control.When the most recent control point exceeded the UCL value by 20%, the company should
A)believe that a random bad luck chance occurred and proceed.
B)suspect that an assignable cause of variation now exists and can be found.
C)ignore the control point completely, as it is simply an outlier.
D)wait for the next four samples to be taken to see if a trend develops.

Question

Quizplus · Accepted Answer

When an x-bar chart point exceeds the UCL value, it suggests that an assignable cause of variation exists, and the process is no longer in control. Therefore, the company should suspect that an assignable cause of variation now exists and can be found, and further investigate the issue to bring the process back in control.

A Company Believes a Process Monitored by an X-Bar Chart