Question: 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.

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 yrs, and a standard deviation of 1.5. What is the 95% confidence interval for the population mean?

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