Dictionary

z–test

noun \ˈzē-ˌtest\

Definition of Z-TEST

:  any of several statistical tests that use a random variable having a z distribution to test hypotheses about the mean of a population based on a single sample or about the difference between the means of two populations based on a sample from each when the standard deviations of the populations are known or to test hypotheses about the proportion of successes in a single sample or the difference between the proportion of successes in two samples when the standard deviations are estimated from the sample data
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First Known Use of Z-TEST

1951

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