b. What do you notice about the process control chart that might concern you as a quality control engineer at Brrrr! Ice? Why would the engineers stop the process after the 19th hour?
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c. Even though a process is entirely within the process control limits, a process is considered out of control if nine consecutive points lie above or below the centerline of the process control limits. What size of ice cube is in the center between the UCL and the LCL?
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d. Add the centerline to your graph and determine whether this process is out of control.
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e. Make a conjecture in the context of the problem as to what in the manufacturing process may cause a “nine points loss of control.”
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