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

User Piotr Jaszkowski
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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.
User Francesco Bonizzi
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