When performing a Z hypothesis test for means, we must have that Group of answer choices The distribution is normal AND the sample size is at least 30 Also, the population standard deviation is known The distribution is normal OR the sample size is at least 30 Also, the population standard deviation is known The distribution is normal AND the sample size is at least 30 Also, the population standard deviation is unknown The distribution is normal OR the sample size is at least 30 Also, the population standard deviation is unknown

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When performing a Z hypothesis test for means, we must have that  Group of answer choices The distribution is normal AND the sample size is at least 30  Also, the population standard deviation is known  The distribution is normal OR the sample size is at least 30  Also, the population standard deviation is known  The distribution is normal AND the sample size is at least 30  Also, the population standard deviation is unknown  The distribution is normal OR the sample size is at least 30  Also, the population standard deviation is unknown

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Question: When performing a Z hypothesis test for means, we must have that: Group of answer choices The distribution is normal AND the sample size is

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