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A sample of 23 observations is selected from a normal population. The sample standard deviation is 23.25, and the sample mean is 22 54 a. Determine the standard error of the mean. (Round the final answer to 4 decimal places.) The standard error of the mean is points b. Determine the 80% confidence interval for the population mean. (Round the final answers to 2 decimal places.) 01:40:31 The 80% confidence interval for the population mean is between and c. If you wanted a wider interval, would you increase or decrease the confidence level? Files (Click to select) v