Standard normal distribution, represented by the letter Z, is the normal distribution having a mean of 0 and a Normal distributions are symmetrical, bell-shaped distributions that are useful in describing real-world data. Then use the standard normal table to find probabilities. Since probability tables cannot be printed for every normal distribution, as thereĪre an infinite variety of normal distributions, it is common practice to convert a normal to a standard normal and Probability that a statistic is observed below, above, or between values on the standard normal distribution, and byĮxtension, any normal distribution. ![]() ![]() Which are the values of the cumulative distribution function of the normal distribution. ![]() A standard normal table, also called the unit normal table or Z table, is a mathematical table for the values of Φ,
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