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Standard Deviation definitions

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  • Standard Deviation
    A measure indicating how much data values deviate from the mean, with higher values showing greater spread.
  • Measure of Variation
    A numerical value that describes the extent to which data points differ from each other in a dataset.
  • Mean
    The arithmetic average of a dataset, found by summing all values and dividing by the number of observations.
  • Median
    The middle value in an ordered dataset, dividing the data into two equal halves.
  • Sample
    A subset of a population used to estimate characteristics of the whole group.
  • Population
    The entire group of individuals or items under consideration in a statistical study.
  • Sigma
    A mathematical symbol representing the sum of a set of values, often used in statistical formulas.
  • X Bar
    A symbol representing the mean of a sample, calculated by dividing the sum of sample values by the sample size.
  • N
    A symbol denoting the total number of observations in a population or sample.
  • S
    A symbol representing the standard deviation of a sample, quantifying data spread.
  • Dispersion
    The degree to which data values are spread out or clustered together in a dataset.
  • X Squared
    Each data value multiplied by itself, used in calculations for variance and standard deviation.
  • Variance
    The average of the squared differences from the mean, serving as a precursor to standard deviation.
  • Equation
    A mathematical statement used to calculate statistical measures such as mean or standard deviation.
  • Sigma X
    The sum of all data values in a dataset, a key component in statistical calculations.