Question: Question 9 [5 A sample of 10 observations is selected from a normal population for which the population standard deviation is known to be 5.

Question 9 [5 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. Determine the 95% confidence interval for the population mean. c. Explain whvr we can use the formula used above to determine the 95% confidence interval, even though the sample size is less than 30

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