A point in a process has been determined to be out of control. When investigating the cause, Bill determined that only common chance variation was present. Later it was determined that the actual cause was assignable cause variation. Bills determination was incorrect and is an example of .

Variation

Explanation:

Variation can be determined in a process by the use of control charts in determining them. also control charts helps to determine how controllable a process is or could be

the causes of Variation of a process can be classified into a common cause or an assignable cause, a common cause variation can be attributed to wear and tear of materials, poor working conditions, measurement errors and computer response times are some of the reasons for a common cause variation in a process. while assignable cause variations are unnatural causes of variations in control chart processes

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