Statistics and Probability Dictionary

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T Score

The t statistic (aka, the t score) is defined by:

t = [ x - μ ] / [ s / sqrt( n ) ]

where x is the sample mean, μ is the population mean, s is the standard deviation of the sample, and n is the sample size.

The distribution of this t statistic is called the t distribution or the Student t distribution. The t distribution can be used whenever samples are drawn from populations possessing a bell-shaped distribution (i.e., approximately normal).

See also:   Tutorial: Student t Distribution | T Distribution Calculator