Cecil Rice Export

796 Words Aug 23rd, 2015 4 Pages
CECIL RICE EXPORT, ALEXANDRIA, EGYPT

1. What control charts should be used to determine whether the process is in control or out of control?

We should use x-Charts and R-Charts to determine whether the process is in control or out of control. X-Charts are usually used when we know standard deviation of the sample. We calculate the upper and lower control limits based on that data. For this data, we assumed the standard deviation as 3 and we found the upper and lower limits for each day’s shifts.

According to Monday Shift 1 (00:00 to 08:00), the lower limit is 69.23 hence the numbers that are below 69.23, are becoming out of control. And the upper limit is 71.91, so the numbers which are above 71.91, become out of control due
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Shift 2 from 08:00 to 16:00, the upper control limit is 71.24 and the lower control limit is 68.55. Shift 3 from 16:00 to 00:00, the upper control limit is 71.05 and 68.37. The best shift in terms of productivity is shift 3 from 16:00 to 00:00.

Finally, for Wednesday the best shift is from 16:00 to 00:00. Because the customers expect the bags that are closest to the specific mean 70. For R- Charts, we assumed mean as 70 and found the upper and lower control limits for each days.

For Monday shift 2, from 08:00 to 16:00, it seems more profitable when we considered with the other shifts on Monday. The upper and lower control limits are 4879 and 4865 pounds. Furthermore, for Tuesday, as same as Monday shift 2, from 08:00 to 16:00 is more suitable than other shifts for customers. We calculated the upper and lower control limits as 4942 and 4900 pounds. For the last shift, the best and more productive hours are from 16:00 to 00:00 and the upper and lower limits are found as 4977 and 4900 pounds.

3. Cecil rice export is planning on providing incentives for senior personnel to rotate into other shifts to better mix personnel among the shifts. If the same control charts were used for all three shifts, what would be the control limits of these charts?

Each shift in each day, the productivity hours change according to the personals and seniors. In

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