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Assessing Variance 1

  • Standard Deviation
    • Abbreviated SD for the sample and σ for the population
    • Most widely used measure of score variance
    • Determines how far the average score varies or deviates from the mean.
    • Works very well in a normal or close to normal distribution
  • Variance
    • Abbreviated S2 for the sample and the σ for the population
    • The square of Standard Deviation
    • Not used often due to the high number it provides, but necessary in eliminating the possibility of a negative number