A z-statistic is used for a problem involving any sample size and an unknown population standard deviation.

Name: A z-statistic is used for a problem involving any sample size and an unknown population standard deviation.
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A z-statistic is only used when the population standard deviation is known, and when the sample size is large (i.e. n ≥ 30). When the population standard deviation is unknown and/or the sample size is small (i.e. n < 30), a t-statistic should be used instead.

A Z-Statistic Is Used for a Problem Involving Any Sample