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Admissions wants to estimate the mean age of students. In a random sample of 20 students, the mean is 22.9 years and the standard deviation

Admissions wants to estimate the mean age of students. In a random sample of 20 students, the mean is 22.9 years and the standard deviation is 1.5. Assuming that student age is normally distributed, you decide to construct a 90% CI of the mean student age. Which critical value will you use

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