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A lowercase z counting standard deviations from the mean.
Also known as: Standard score, Z value, Normal score
A z-score says how many standard deviations a value sits from the mean. It puts different measurements on one scale, which is what makes it useful, and it assumes the mean and standard deviation are known rather than estimated.
Reports how many standard deviations an observation lies from the mean of its distribution.
Contexts: Mathematics
Places measurements taken on different scales onto one common scale, which is its main practical use.
Contexts: Mathematics
Assumes a known standard deviation; where it is estimated from the sample a t-statistic is used instead.
Contexts: Mathematics
A single lowercase letter of two horizontal strokes joined by a diagonal, set in italic type.