Which of the following is true of special cause variation
A) It cannot be explained or understood.
B) It occurs sporadically and can be prevented.
C) It cannot be detected using statistical methods.
D) It accounts for about 80 to 95 percent of the observed variation in a process.

Question

Quizplus · Accepted Answer

Special cause variation is characterized by sporadic occurrences that are not present in the system on a consistent basis. It is often caused by a specific event or occurrence that can be prevented or controlled.  A is incorrect because special cause variation can often be explained or understood. C is incorrect because statistical methods, such as control charts, are used to detect special cause variation. D is incorrect because special cause variation typically accounts for a smaller percentage of observed variation in a process, while common cause variation accounts for a larger percentage.

Which of the Following Is True of Special Cause Variation