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Meaning of population parameter

popula'tion param"eter

Pronunciation: [key]
— Statistics. Statistics.
  1. a quantity or statistical measure that, for a given population, is fixed and that is used as the value of a variable in some general distribution or frequency function to make it descriptive of that population: The mean and variance of a population are population parameters.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.