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Standard normal table : ウィキペディア英語版
Standard normal table
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. 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. 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.
==Normal and standard normal distribution==
Normal distributions are symmetrical, bell-shaped distributions that are useful in describing real-world data. The ''standard'' normal distribution, represented by the letter Z, is the normal distribution having a mean of 0 and a standard deviation of 1.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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