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A personnel manager has found that, historically, the scores on aptitude tests given to applicants for...

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 25.34 points. A random sample of 15 test scores from the current group of applicants had a mean score of 69.33 points. Based on these sample results, a statistician found for the population mean a confidence interval extending from 57.4876 to 81.1724 points. Find the confidence level of this interval. Round off your answer to two decimal pl

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