Question: A sample of 10 observations is selected from a normal population for which the population standard deviation is known to be 5. The sample mean

A sample of 10 observations is selected from a normal population for which the population standard deviation is known to be 5. The sample mean is 20.
a. Determine the standard error of the mean.
b. Explain why we can use formula (8–1) to determine the 95% confidence interval, even though the sample size is less than 30.
c. Determine the 95% confidence interval for the population mean.

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