Students test

See t-test. A test based on the t-distribution. An important example uses the result that t = *

s\4n has a t-distribution with (n-1) degrees of freedom, where a simple random sample is taken from a normal population, where x is the sample mean, ^ is the population mean and s the sample standard deviation. It was invented by William Gossett (1876-1937) a chemist employed by Guinness in Dublin and, later, London. He used the nom-de-plume 'Student' because Guinness employees were not permitted to publish. The only other students in question seem to have been Gossett's consumers (of his extensive statistical work, of course).

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