![]() ![]() ![]() Standard normal curve is symmetrical in nature, so the table can be used for values going in any of direction, for example a negative 0.45 or positive 0.45 has an area of 0.1736. ![]() Since probability tables cannot be printed for every normal distribution, as there are an infinite variety (families) of normal distributions, so it is common practice to convert a normal to a standard normal and then use the standard normal table to find the required probabilities (area under the normal curve). Standard normal table 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 table for the values of Φ calculated mathematically, and these are the values from the cumulative normal distribution function. ![]()
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February 2023
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