Solutions Operations management

Six samples of five observations each have been taken of 80-Kg concrete slabs produced by a machine

Question: Six samples of five observations each have been taken of 80-Kg concrete slabs produced by a machine, and the results are displayed in table 5 below.

Sample
1	2	3	4	5	6
79.2	80.5	79.6	78.9	80.5	79.7
78.8	78.7	79.4	79.4	79.6	80.6
80.0	81.0	80.4	79.7	80.4	80.5
78.4	80.4	80.3	79.4	80.8	80.0
81.0	80.1	80.8	80.6	78.8	81.1

a. Using A2 value from the table, determine upper and lower control limits for a sample mean control chart.

b. Determine upper and lower control limits for a sample range control chart

c. Based on the calculated control limits, is the process in control? Why?

d. Using the above control charts, check if the process is still in control after having a sample with the 5 observations: 81.0, 81.0, 80.8, 80.6, and 80.5.

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Answer: The solution consists of 5 pages
Solution Format: Word Document