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The Width of a Bronze Bar Is Intended to Be

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The width of a bronze bar is intended to be one-eighth of an inch (0.125 inches). Inspection samples contain five bars each. The average range of these samples is 0.01 inches. What are the upper and lower control limits for the x-bar and R-chart for this process, using 3-sigma limits?


Definitions:

Form Utility

The value added to goods through a change in form, shape, or appearance, to make them more useful or appealing.

Raw Materials

Basic substances in their natural, modified, or semi-processed states, used as inputs to a production process for manufacturing finished goods.

Quality Control

A process through which a business seeks to ensure that product quality is maintained or improved and manufacturing errors are reduced or eliminated.

Visual Inspection

The process of examining objects, components, or materials for defects using human sight, sometimes assisted by optical instruments.

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