A national manufacturer of ball bearings is experimenting with two different processes for producing precision ball bearings. It is important that the diameters be as close as possible to an industry standard. The output from each process is sampled and the average error from the industry standard is measured in millimeters. The results are presented next. 
The researcher is interested in determining whether there is evidence that the two processes yield different average errors. The population standard deviations are unknown but are assumed equal. This example is what type of test?
Definitions:
Navistar International
An American holding company that owns the manufacturer of International brand commercial trucks, buses, defense vehicles, and engines.
Hollow Box-Section
A hollow, box-shaped section of material, often metal or plastic, used in construction and manufacturing for its strength and lightweight characteristics.
Beam Axles
A type of axle design where a single piece runs across the vehicle, supporting the wheels on opposite sides, typical in certain trucks and older vehicles.
Hollow Round-Section
A type of structural component characterized by its round, tubular shape with a hollow center, commonly used in various engineering and construction applications.
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