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4 Tutorials that teach Standard Scores and Z-Scores
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Standard Scores and Z-Scores
Common Core: S.ID.4

Standard Scores and Z-Scores


This lesson will explain standardized scores.

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Terms to Know
Standard Scores/z-scores

A value that explains how many standard deviations away from the mean an observation is. It can be positive (if the value is above the mean) or negative (if the value is below the mean).

Formulas to Know

z space minus s c o r e space f o r space s a m p l e equals fraction numerator x minus top enclose x over denominator s end fraction
z space minus s c o r e space f o r space p o p u l a t i o n equals fraction numerator x minus mu over denominator sigma end fraction