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What do population, parameter, census and sample mean in statistics?

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Population is a set of similar items or events. It can be a group of any existing objects.

Parameter is an very important component of population. It is a numerical quantity which features population or some aspect in it.

Census is a survey which is conducted after a complete observation belonging to any population.

Sample generally refers to a set of observations. Here, it refers to a set of observations drawn from a population.

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