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Which condition must be met to conduct a test for the difference in two sample means using a z-statistic?

Which condition must be met to conduct a test for the difference in two sample means using a z-statistic?
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5 votes
Which condition must be met to conduct a test for the difference in two sample means using a z-statistic?

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User Dlundquist
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1 Answer

2 votes
I believe the standard deviations of the population have to be known
answered
User SnakeEyes
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