Furthermore, if ‘X’ is a random variable from a usual distribution with a mean ‘μ’ and a standard deviation ‘σ’, therefore, its Z-score might be calculated from ‘X’ by doing the subtraction of ‘μ’ and dividing it with ‘σ’.įor the average of a sample from a populace ‘n’ in which we have the mean ‘μ’ and we have the standard deviation ‘σ’. It is a method for comparing the results from a test to a ‘normal’ population. In addition, it is a common practice to transform a normal to a standard normal and then apply the z-score table to find out the possible probabilities. Moreover, this is because there is an endless variety of usual distribution. Since the probability tables are not printable for every usual distribution. However, the Z-Score also called the standard score specifies how many standard deviations an entity is from the mean. These values are of the cumulative distribution function of a usual distribution. 2 Question on Z-Score Table Definition of Z-Score TableĪ standard normal table that is also known as the z-score table or Z-Score Table, is basically a mathematical table used for the values of ‘ϕ’.
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