The choice between a z-test and a t-test for a population mean depends primarily on:

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asked Apr 27, 2018 120k views

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Francesco Bonizzi · Answer 1 · 2018-05-03T13:46:02+0000

Z-test should be used when the parent standard deviation is known and the sample size is greater than or equal to 30 (to satisfy the Central Limit Theorem). A T-test should be used when these two rules do not apply.

The choice between a z-test and a t-test for a population mean depends primarily on:

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