For Exercises 3.1 to 3.4, see page 124; for 3.5, see page 126; for 3.6, see page 126; and for 3.7 and 3.8, see page 127.
3.5 Check out the Bureau of Labor Statistics website.
Visit the Bureau of Labor Statistics website, bls.gov. Find a set of data that interests you. Explain how the data were collected and what questions the study was designed to answer.