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Jarred is monitoring his current process with a control chart, the upper control limit(UCL) is .82, the lower control limit (LCL) is .25, and mean is .53. The data set thus far is as follows: .4, .49,.50,.52,.53, .68, .70, .87, .73, .73,.74.
What does his data tell him about the process?
The process is in control
He should adjust his control limits to improve process
He will need to take more data to determine process state
The process is out of control
The process is in control is incorrect as one of the data points exceeded the upper control limit; process is out of control. The process is out of control is correct as process is out of control due to one point exceeding UCL. More data needed is incorrect ; taking more data points will only likely show further out of control condition based on existing data. Adjusting control limits upward is incorrect; without further calculations and data analysis if limits were just randomly adjusted process would still likely be out of control and produce poor quality parts. (PMBOK 2013 Rev 5th Edition, pgs 227-252).
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