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: 
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.
Definitions:
Triarchic Theory
A theory of intelligence proposed by Robert Sternberg that suggests there are three aspects of intelligence: analytical, creative, and practical.
Contextual Component
The aspect of a situation or environment that includes all the surrounding factors and conditions influencing a particular event or behavior.
Componential
Relating to or involving the components of a system or structure in analysis or understanding.
Experiential
Pertaining to or derived from experience or the act of living through an event.
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