b) compute the margin of error at a 90% confidence level.

Exercise 8-4 Algo Consider a population with a population standard deviation of 12.9. In order to compute an interval estimate for the population mean, a sample of 39 observations is drawn. (You may find it useful to reference the table.) a. Is the condition that is normally distributed satisfied? Yes O No b. Compute the margin of error at a 90% confidence level. (Round final answer to 2 decimal places.) Margin of error c. Compute the margin of error at a 90% confidence level based on a larger sample of 325 observations. (Round final answer to 2 decimal places.) Margin of error 1.18