Collins Concise English Dictionary © HarperCollins Publishers::
Student's t n
  1. 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
Etymology: after Student, the pen name of W. S. Gosset (1876–1937), English statistician and research scientist
'Student's t' also found in these entries (note: many are not synonyms or translations):
t - t distribution - T, t - Student's t distribution - Student's t-test

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