![]() This equates to the area of the distribution below Z. Cumulative gives a probability that a statistic is less than Z. ![]() Cumulative from Mean gives a probability that a statistic is between 0 (mean) and Z.Standard Normal Tables use at least three different conventions: Since probability tables cannot be printed for every normal distribution, as there are an infinite variety of normal distributions, it is common practice to convert a normal to a standard normal and then use the standard normal table to find probabilities. It is used to find the probability that a statistic is observed below, above, or between values on the standard normal distribution, and by extension, any normal distribution. ![]() A standard normal table, also called the unit normal table or Z table, is a mathematical table for the values of Φ, which are the values of the cumulative distribution function of the normal distribution. ![]()
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