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
