Control limits are chosen statistically so that there is a high probability that sample statistics will fall randomly between ________.
A)the lower control limit and the upper control limit if the process is out of control
B)the lower process specification limit and higher process specification limit if the process is in control
C)the lower control limit and the upper control limit if the process is in control
D)the lower process specification limit and higher process specification limit if the process is out of control

Question

Quizplus · Accepted Answer

Control limits are designed to capture random variation in a process, so control limits are chosen to contain a large proportion of sample statistics if the process is in control. Therefore, the correct answer is C, which represents the lower and upper control limit when the process is in control. Option A and D are incorrect because they represent the incorrect scenarios for control limits. Option B is incorrect because it refers to process specification limits, which are unrelated to control limits.

Control Limits Are Chosen Statistically So That There Is a High