A producer of beverage containers wants to ensure that a liquid at 90°C will lose no more than 4°C after 30 minutes. Containers are selected at random and subjected to testing. Historical data shows the standard deviation to be 0.2°C. The quality control team has set 3.5 and 4.5°C as the specification limits. Here are the data from the last 12 containers tested:

a)€‚Make a control chart of these data using the specification limits given.
b)€‚Does the process seem to be in control?
c)€‚What is the value of Cp for the process?
d)€‚Given this value of Cp, what recommendations might you make to the quality control team?

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Temperature Loss (°C) 3.89 3.71 4.14 4.12 3.74 3.99 Temperature Loss (°C) 4.22 4.02 4.48 3.93 3.87 3.94 Container # Container # 10 12