Use both formula and probability distributions to answer each question. Then use a function in your calculator to check your answer. Make sure you always write down what you entered into your calculator.

Question 3

The General Social Survey recently asked 1972 adults how many years of edu- cation they had. The sample mean was 13.37 years with a standard deviation of 3.13 years. Construct a 98% confidence interval for the number of years of education.