The Wilcoxon Rank Sum Test (Like Most of the Nonparametric

question 23

Multiple Choice

The Wilcoxon rank sum test (like most of the nonparametric tests presented in your book) actually tests to determine whether the population distributions have:

• A) identical locations
• B) identical spreads (variances)
• C) identical shapes
• D) all of these
• E) none of these

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Definitions:

Preload Drag

A condition characterized by friction and drag in machinery components, typically bearings, caused by an applied preload force to ensure clearance elimination and precise operation.

Endplay

Linear play in a shaft, wheel, or rotor. The slang term for this, slop, describes the condition well. Some OEMs use the term axial slop to describe endplay.

Truck Wheel Seal

A component used in trucks to prevent lubricants from leaking out of the wheel bearings and to keep contaminants out.

Seal Driver

A tool used in the installation of seals in machinery, ensuring a proper fit without damage to the seal or housing.