The sampling distribution of the quantity (n-1) s2/ 
2 is the
Definitions:
Jean Piaget
A Swiss psychologist known for his pioneering work in child development and cognitive psychology.
Cognitive Stage
A phase of cognitive development in individuals characterized by specific capabilities of thinking, understanding, and processing information.
Concrete Operational
A stage in cognitive development theory where children gain the ability to think logically about concrete events.
Middle-Aged Americans
Refers to adults in the United States typically aged between 45 and 65, often experiencing unique social, economic, and health-related issues.
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