Each number on the horizontal line corresponds to z-score. The standard normal distribution is a type of special normal distribution with a mean (µ) of 0 and a standard deviation of 1.Ī standard normal distribution always mean zero and has intervals that increase by 1. What is a Standard Normal Distribution?Ī Normal Standard Distribution curve is a symmetric distribution where the area under the normal curve is 1 or 100%. Similarly, if Z value is negative, it means the value (x) is below the mean. If the Z value is positive, it indicates that the value or score (x) is above the mean. Technically, Z-score tells a value (x) is how many standard deviations below or above the population mean (µ). In other words, Z-score measures the dispersion of data. Z scores (Z value) is the number of standard deviations a score or a value (x) away from the mean.
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