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38. A student wanted to construct a 95% confidence interval for the mean age of students in her statistics class. She randomly selected nine students.

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38. A student wanted to construct a 95% confidence interval for the mean age of students in her statistics class. She randomly selected nine students. Their mean age was 20.1 years, with a sample standard deviation of 1.5 years. What is the 95% confidence interval for the population mean

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