Ages of students A simple random sample of 70 US college stu

Ages of students: A simple random sample of 70 U.S. college students had a mean age of 21.53 years. Assume the population standard deviation is sigma = 3.82 years. Construct an 80% confidence interval for the mean age of U.S. college students. Round the answers to two decimal places. An 80% confidence interval for the mean age of U.S. college students is

n - 70

mu = 21.53