t distribution
noun Date: circa 1957 a probability density function that is used especially in testing hypotheses concerning means of normal distributions whose standard deviations are unknown and that is the distribution of a random variable t = (un)/v where u and v are themselves independent random variables and u has a normal distribution with mean 0 and a standard deviation of 1 and v2 has a chi-square distribution with n degrees of freedom — called also student's t distribution

New Collegiate Dictionary. 2001.

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