A hypothesis test will be used to test the claim that a population mean μ > 25. The sample size is n = 21, σ = 6.10, and the sample data is selected from a population that is normally distributed. What distribution should be used to test this claim?
Added by Gail T.
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The rule of thumb is that if the population standard deviation (σ) is known and the sample size is large (typically n > 30), we use a z-distribution. If the population standard deviation is unknown and the sample size is small (typically n < 30), we use a Show more…
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