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z score

z score A z score is a standardized value showing how many standard deviations a score lies above or below the mean of its population.

A z score is a standardized value showing how many standard deviations a score lies above or below the mean of its population. Converting a raw score to a z score is called standardizing, and this does not make the values normally distributed if the original data were not normal.

Also see

Sources

Drafting source: Online Statistics Education, version 2 (David M. Lane, project leader). Version 2; publisher statement snapshot 2026-10-18; SHA-256 0dcad9ee85f61f9e2bb24d26279de155ac749164ea4da2a3bffeabcf9ea471a6. “Z score” (z_score.html).
public-domain-US · Source snapshot SHA-256: af45cea422aacff4bb18daac7486b53e1933c278fd3fc59fc3722c552da7abbf

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PsychTerms (psychterms.org), CC BY 4.0, version 1. “z score.” Development preview.

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