Student's t
noun
a statistic often used to test the hypothesis that a random sample of normally distributed observations has a given mean, μ; given by t = (̄x– μ) √n/s where ̄x is the mean of the sample, s is its standard deviation, and n is the size of the sample
Word Origin for Student's t
after
Student, the pen name of W. S. Gosset (1876–1937), English statistician and research scientist