Examlex
Why does σ pose a problem for sample size calculation for a mean? How can σ be approximated when it is unknown?
Age Grades
Social categorizations based on age, often used in various cultures to organize community roles and responsibilities according to life stages.
Open-class Societies
Societies characterized by fluidity in social mobility and the absence of rigid caste systems, allowing individuals to change their social status.
Closed-class Societies
Societies characterized by strict social stratification and limited mobility, where individuals' roles and statuses are often predefined.
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