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 here. 
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. What is the null hypothesis?
Definitions:
Public Assistance
Government programs designed to provide financial aid, services, or support to individuals or families in need.
Supplemental Security Income
A federal program in the United States that provides additional income to elderly, blind, or disabled individuals with little or no income to meet basic living needs.
Medical Expenses
Costs incurred by individuals for healthcare services, treatments, medications, and other health-related needs.
TANF
Temporary Assistance for Needy Families, a federal assistance program in the United States aimed at helping families achieve self-sufficiency through employment.
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