Statistics Control Limits
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A tire company is interested in monitoring the process that produced tread thickness on its tires. Every hour 4 tires are selected from production and the tread thickness is measured. Data for the past 25 days is shown as follows:
(Please see the attached file.)
a. What type of control chart would you recommend be used in this case?
b. Compute the upper and lower control limits for these data.
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