When testing a hypothesis about a population mean (μ), what are the two main distributions used for the test statistic (Z or t)? How do you choose between them?
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When testing a hypothesis about a population mean (μ), what are the two main distributions used for the test statistic (Z or t)? How do you choose between them?
when testing a population mean, we use z if the population standard deviation is known or the sample size is large. we use t if the standard deviation is unknown and the sample size is small.