An important dimension on a tire tread is called the shoulder gauge. For a particular model the design specifications for shoulder gauge is 0.48 in ± 0.03 in. The following data were collected over a period of one week in a certain tire plant.

a. Construct control charts for these data and determine if the process is in a state of statistical control
b. If appropriate, estimate the process standard deviation.
c. Using the results from parts a and b, estimate the percentage of total process output that will lie outside each specification limit.
d. What would be your recommendations to management concerning this process?

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