Question: Problem 2: (full correct answer - 40 points) Thermostats are subjected to rigorous testing before they are shipped to air conditioning technicians around the world.

Problem 2: (full correct answer - 40 points) Thermostats are subjected to rigorous testing before they are shipped to air conditioning technicians around the world. Results from last six samples are shown in the table. Is the process under control? Which control charts did you use and why? Unit Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 75,5 70,4 72,6 71,3 71.1 73.1 73,3 1 72.2 70,5 2 72 72,7 71,2 3 70 70,6 71,9 72.4 73 72,2 4 71,4 70,8 69,3 74,1 73,1 69,8 5 70,8 70,9 70,7 73 71,5 70,5

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