question archive 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 21
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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 21.86 points. A random sample of 14 test scores from the current group of applicants had a mean score of 72.52 points. Based on these sample results, a statistician found for the population mean a confidence interval extending from 61.887 to 83.153 points. Find the confidence level of this interval. Round off your answer to two decimal places. _______
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