If a sample of items is taken and the mean of the sample is outside the control limits, the process is:
A) likely out of control and the cause should be investigated.
B) in control, but not capable of producing within the established control limits.
C) within the established control limits with only natural causes of variation.
D) monitored closely to see if the next sample mean will also fall outside the control limits.
E) producing high quality products.

Question

Quizplus · Accepted Answer

If the mean of the sample is outside the control limits, it indicates that the process is likely out of control and the cause should be investigated to bring it back to control. This is because the control limits are established based on the process capability and any data falling outside these limits indicates that the process is not capable of producing within the established control limits. Therefore, option A is the best choice.

If a Sample of Items Is Taken and the Mean