The population is the occupants of all seats in the sports arena; the sample is the occupants of the 100 selected seats.
Population in research is a complete set of elements that possess a standard parameter between them while sample is defined as a smaller part of the whole or a subset of the entire population. Sample represents a part of the population in a study.
Now, in this question, the population is clearly the occupants of all seats in the sports arena while the sample is the occupants of the 100 selected seats.
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