z distribution

noun

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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Dictionary Entries near z distribution

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z-coordinate

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z distribution

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zea

zeal

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The first known use of z distribution was in 1968

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