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)
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Observations |
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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 |