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The degrees of freedom used when testing two independent samples where the population standard deviation is unknown is
Religious Groups
Collections of individuals who share the same faith or beliefs and often gather for worship, spiritual practices, and community support.
Businesses
Organizations engaged in commercial, industrial, or professional activities with the aim to generate earnings or profit.
Classes
Social categories reflecting differences in economic status, lifestyle, education, and occupational prestige among various groups within a society.
Apartheid System
A policy or system of segregation or discrimination on grounds of race, specifically referring to the former socio-political system in South Africa.
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