Z Score

Stacie Ezelle Taylor

Z scores are also called standard units or standard scores. A z score standardizes values of a random variable from a normal (or presumed normal) distribution for comparison with known probabilities in a standard normal probability distribution table or z table. A z score is unitless and is simply a measure of the number of standard deviations a value is from the mean. The z score is especially useful to indicate where a particular data point is relative to the rest of the data. A positive z score indicates that the point is above the mean, while a negative z score indicates that the point is below the mean. The z score removes varying units (e.g., pounds or kilograms) and allows for easy determination of whether a particular result is unusual. Most significance testing, hypothesis ...

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