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Next, the upper control limit (UCL) and lower control limit (LCL) for the individual values (or upper and lower natural process limits) are calculated by adding or subtracting 2.66 times the average moving range to the process average: = ¯ + ¯.
Control charts are graphical plots used in production control to determine whether quality and manufacturing processes are being controlled under stable conditions. (ISO 7870-1) [1] The hourly status is arranged on the graph, and the occurrence of abnormalities is judged based on the presence of data that differs from the conventional trend or deviates from the control limit line.
A National Water Plan recommends projects and programs that should be taken in respect of the development, control, usage, and storage of water as well as its supply, distribution and disposal. [ 8 ] The Watersheds Protection Act (1963) is the law governing watersheds in Jamaica and is administered by the Natural Resources Conservation Authority.
The Western Electric rules are decision rules in statistical process control for detecting out-of-control or non-random conditions on control charts. [1] Locations of the observations relative to the control chart control limits (typically at ±3 standard deviations) and centerline indicate whether the process in question should be investigated for assignable causes.
The importance of knowing the natural process variation becomes clear when we apply statistical process control. In a stable process, the mean is on target; in the example, the target is the filling, set to 1 litre. The variation within the upper and lower control limits (UCL and LCL) is considered the natural variation of the process.
The National Water Commission (NWC), which produces more than 90% of Jamaica's total potable water supply, operates a network of more than 160 wells, over 116 river sources (via water treatment plants) and 147 springs. The various Parish Councils and a small number of private water companies supply the rest of the potable water.
The control limits are set at three standard deviations on either side of the process mean, and are known as the upper control limit (UCL) and lower control limit (LCL) respectively. [2] If the process data plotted on the control chart remains within the control limits over an extended period, then the process is said to be stable. [2] [3]
Its mission is "to develop potential sources of irrigation water, and to manage these together with existing resources, by the provision of effective and efficient delivery systems up to farm-gate, geared towards the enhancement of Jamaica’s agricultural development". Under the Irrigation Act, the commission furnishes and maintains efficient ...