Operations Management Question

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1.    Thermostats are subjected to rigorous testing before they are shipped to air conditioning technicians around the world. Results from the last five samples are shown in the table. Draw and R Chart and an x-bar chart.  Based on the charts, is the process under control? (20 Points)

 

 

Observations

Sample

1
2
3
4
5

1

73.5

70.8

72.2

73.6

71.0

2

71.3

71.0

73.1

72.7

72.2

3

70.0

72.6

71.9

72.4

73.3

4

71.1

70.6

70.3

74.2

73.6

5

70.8

70.7

70.7

73.5

71.1

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