Suppose that a tire manufacturer uses 
and R charts based on subgroups of size 4 to monitor tire diameter.The 
andR charts are found to be in statistical control,with 
inches.A histogram of the tire diameter measurements indicates that these measurements are approximately normally distributed.Find the sigma level capability of the process.
Definitions:
Per Capita Income
Represents the average income earned per person in a given area in a specified year.
Standard Of Living
The level of wealth, comfort, material goods, and necessities available to a certain socioeconomic class or a certain geographic area.
Per Capita Income
The average income earned per person in a given area in a specified year, often used to gauge the economic prosperity of a population.
Tariff Barriers
Taxes imposed on imported goods to protect domestic industries from foreign competition and raise government revenue.
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