Answer Happy

A sample of 9 observations is selected from a normal population for which the population standard deviation is known to be 6. The sample mean is 14 a. Determine the standard error of the mean (Round the final answer to 3 decimal places.) . The standard error of the mean is b. Explain why we can use formula (8-1) to determine the 95% confidence interval, even though the sample size is less than 30. The population is normally distributed and the population variance is known. c. Determine the 95% confidence interval for the population mean (Round the intermediate calculation to 3 decimal places. Round the final answers to 3 decimal places.) The 95% confidence interval for the population mean is between and