the mean age of college graduate in the united states is 25 years.

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the mean age of college graduate in the united states is 25 years.

the mean age of college graduate in the united states is 25 years. a sample of 100 udc graduates gives a mean age of 28 years with a standard deviation of 8 years.

a. Construct a 95% confidence interval for the mean age of all UDC students at graduation.


b. b. Construct a 99% confidence interval for the mean age of all UDC students at graduation.