Examlex
The t distribution is used to develop a confidence interval estimate of the population mean when the population standard deviation is unknown.
Eurasia and Africa
The combined continental landmass of Europe and Asia, and the second-largest continent, Africa.
Social Classes
Categories of people in a society who share similar positions in terms of wealth, education, job status, and power.
Social Status
A person's standing or rank in society, which can be determined by wealth, occupation, education, or family lineage, among other factors.
Early Civilizations
The first advanced and complex societies that developed writing, monumental architecture, and centralized administration, among other characteristics.
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