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A college admissions director wishes to estimate the mean age of all students currently enrolled. In...

A college admissions director wishes to estimate the mean age of all students currently enrolled. In a random sample of 19 students, the mean age is found to be 23.7 years. From past studies, the ages of enrolled students are normally distributed with a standard deviation of 10.4 years. Construct a 90% confidence interval for the mean age of all students currently enrolled.

1. The critical value:

2. The standard deviation of the sample mean:

3. The margin of error

4. The lower limit of the interval:


5. The upper limit of the interval4. The lower limit of the interval:


Math   Statistics-And-Probability   
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