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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.
  • From 160 to 173.2
  • From 190 to 210.3
  • From 170.9 to 199.8
  • From 174.1 to 201.7
  • From 169.5 to 198.7
  • *****
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    Carlos Rodriguez <carlos@math.albany.edu>
    This problem was contributed by a student in Elementary Statistics. It is offered as it is with no warranty of any kind
    Last modified: Wed May 13 12:29:11 EDT 1998