Terminology 1

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