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Population
Consists of all subjects are being studied, usually consists of big groups that are expensive and time-consuming to study.
Census
is when an entire population is being studied.
Sample
A group of subjects (human or otherwise) selected from a population. In statistics, we use sample to make a generalization about a population.
Populations
Such data are called Parameters. They are exact and expensive. For example, students of SAIT in 2023 who work part-time.
Samples
Such data are called Statistics to estimate Parameters. For example, International students of SAIT in 2023 who study statistics and work part-time.