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A student wanted to quickly construct a 95% confidence interval for the average age of students in her statistics class. She randomly selected 9...

A student wanted to quickly construct a 95% confidence interval for the average age of students in her statistics class. She randomly selected 9 students. Their average age was 19.1 years with a standard deviation of 1.5 years. What is the 95% confidence interval for the population mean?
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