A personnel manager has found that, historically, the scores on aptitude tests given to applicants for entry-level positions follow a normal distribution with standard deviation 24.32 points. A random...

Extracted text: A personnel manager has found that, historically, the scores on aptitude tests given to applicants for entry-level positions follow a normal distribution with standard deviation 24.32 points. A random sample of 15 test scores from the current group of applicants had a mean score of 73.08 points. Based on these sample results, a statistician found for the population mean a confidence interval extending from 63.1586 to 83.0014 points. Find the confidence level (as a value between zero and one) of this interval.