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11. The president of a large university wishes to compare the standard deviation of the ages of the students presently enrolled to previous years. The

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11. The president of a large university wishes to compare the standard deviation of the ages of the students presently enrolled to previous years. The distribution of ages has been approximately normal. Find the 90% confidence interval for the population standard deviation of the student ages of the university. A random sample of 20 university students has a standard deviation of 6. 1 years and mean of 23.8 years. What is the confidence interval of the population standard deviation

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