z distribution


Definition of z distribution

: a probability density function and especially a normal distribution that has a mean equal to zero and a standard deviation equal to one and that is used especially in testing hypotheses about means or proportions of samples drawn from populations whose population standard deviations are known — compare z-test

First Known Use of z distribution

1968, in the meaning defined above

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The first known use of z distribution was in 1968

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Cite this Entry

“Z distribution.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/z%20distribution. Accessed 4 Jul. 2020.

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