A personal manager has found that historically, the scores on aptitude tests given to applicants for entry-level positions follow a normal distribution with standard deviation 32.4 points. A random sample of nine test scores from the current group of applicants had mean 187.9 points. Find an 80% confidence interval for the population mean score of the current group of applicants. |

Last modified: Wed May 13 12:29:11 EDT 1998