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.

 
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