Ages of students: A simple random sample of 70 U.S. college students had a mean age of 21.69 years. Assume the population standard deviation is a 4.12 years. Construct an 80% confidence interval for...

Extracted text: Ages of students: A simple random sample of 70 U.S. college students had a mean age of 21.69 years. Assume the population standard deviation is a 4.12 years. Construct an 80% confidence interval for the mean age of U.S. college students. Round the answers to at least two decimal places. An 80% confidence interval for the mean age of U.S. college students is