Definition of t distribution
: 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 equated to a fraction whose numerator is u times the square root of n and whose denominator is 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 the square of v has a chi-square distribution with n degrees of freedom —called also student's t distribution
First Known Use of t distribution
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