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03: Terminology I: Population, Parameter, Sample

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Terminology 1

  • Population
    • The entire group of individuals or objects to which we hope to generalize our results
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    • Parameter
      • A summary value of a specific population characteristic (e.g., mean age, standard deviation of IQ’s, median income)
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      • Sample
        • A subgroup of a population. In theory, the ideal sample represents the entire population.
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        • Statistic
          • An observed characteristic of a sample (e.g., 20% improvement rate, range of IQ’s)
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