Facebook YouTube a Amazon * Addons Store M Gmail YouTube Registration Term Beka Bante - Printin.. eBay 5 New Tab Maps Saved Help Save & E 9 - Quiz 3 (Week 9) i A sample of 20 observations is selected from a normal population where the population standard deviation is 22. The sample mean is 11 62. a. Determine the standard error of the mean. (Round the final answer to 3 decimal places.) The standard error of the mean is 01:14 49 b. Determine the 80% confidence interval for the population mean. (Round the z-value to 2 decimal places. Round the final answers to 3 decimal places.) 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? (Click to select) v