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The t distribution always has n degrees of freedom.
Poorest 20 Percent
The segment of a population that ranks at the bottom fifth in terms of income.
Income Mobility
The ability of individuals or families to move up or down the economic ladder within a society over time.
Economic Status
An individual's or area's financial condition and stability, often measured by income, employment, and wealth indicators.
Annual Income
The total amount of money earned by an individual or business in one year from all sources.
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