Statistics Operations Management Supply Chain Management Control Charts

Statistics Operations Management Supply Chain Management  Control Chart

1.  Ten samples of size four were taken from a process, and their weights measured.  The sample averages and sample ranges are in the following table.  Construct and plot an x-bar and R-chart using this data.  Based on your graph, is the process in control?

Sample

Mean

Range

1

20.01

0.45

2

19.98

0.67

3

20.25

0.30

4

19.90

0.30

5

20.35

0.36

6

19.23

0.49

7

20.01

0.53

8

19.98

0.40

9

20.56

0.95

10

19.97

0.79

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