A Manager Wishes to Build a 3-Sigma Range Chart for a Process

question 149

Multiple Choice

A manager wishes to build a 3-sigma range chart for a process. The sample size is five, the mean of sample means is 16.01, and the average range is 5.3. From Table S6.1, the appropriate value of D₃ is 0, and D₄ is 2.115. The UCL and LCL for this range chart are

• A) 33.9 and 11.2
• B) 33.9 and 0
• C) 11.2 and 0
• D) 6.3 and 0
• E) 31.91 and 0.11

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Definitions:

Basic Size

The theoretical exact size from which the limits of size are determined in dimensioning and tolerancing practices.

Tolerance

The allowable deviation from a standard measurement in the manufacturing process, determining how much a part can vary from a specified dimension.

Locational Transition Fits

A type of fit specifying a range wherein there may be either a slight interference or clearance between parts, used for parts requiring precise alignment.

Clearance

The amount of space or distance allowed between two parts for proper fit, function, or movement.