To determine if families with children would use school vouchers to send their children to charter schools, from which of the following populations should you select a sample?

Several variables are associated with longer life expectancy

One way to remove the possible effects of per-capita income as a variable is to examine only countries with similar levels of income per capita. This is an example of using: a. the comparative cases method. b. the multiple cases method. c. a control variable. d. quantitative comparative analysis.

What aspect of the information revolution has characteristics that demonstrate the role of the United States as a first mover?

a. The telephone b. The Internet c. Publishing d. Nuclear weapons e. Media