second moment

Noun
  1. The expected value of the square of the deviations of a random variable from the point of origin (synset 106034169)
    referred to in: statistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters
    is a type of: moment - the n-th moment of a distribution is the expected value of the n-th power of the deviations from a fixed value

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