1. Researchers at a university with an enrollment of 12,000 take a census of the entire student population, asking, "Shoplifting is not only illegal, it raises the prices that we all have to pay. Have you ever shoplifted from the university bookstore?" Based on the preceding, dis- cuss the possible presence of (a) sampling error and (b) nonsampling error.
2. According to the U.S. Bureau of the Census, 27% of U.S. adults are college graduates. In a stratified sample of 200 U.S. adults, approximately how many persons in each of the following categories should be questioned:
(a) college graduate and (b) not a college graduate?
Source: Statistical Abstract of the United States 2009, p. 147.