Question: A simple random sample of size n = 15 is drawn from a population that is normally distributed. The sample mean is found to be

A simple random sample of size n = 15 is drawn from a population that is normally distributed. The sample mean is found to be 23.8, and the sample standard deviation is found to be 6.3. Is the population mean different from 25 at the α = 0.01 level of signiﬁcance?

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Hypotheses H 0 25 versus H 1 25 df 15 1 14 Classical approach This is a twotailed test with 15 1 ... View full answer

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