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The entire set of individuals, items, or measurements that share a common property and are the subject of a statistical study.
A subset of a population selected to represent it for analysis.
Because measuring the entire population is often impractical, costly, or impossible.
A numerical value that describes a characteristic of a population (e.g., μ for mean, σ for standard deviation).
A numerical value that describes a characteristic of a sample (e.g., x̄, s).