In a __________ sample, respondents are used to identify other persons who might qualify for inclusion in the sample.

An advantage of internet-based research includes the fact that

a. researchers interact with participants in the evening when they are generally less busy. b. the researcher doesn't have to worry that participants don't understand the directions. c. the project can generate samples that are broader than the typical samples of college students. d. investigators don't have to worry about informed consent from participants at remote locations or other countries.

When members of Congress talk about the ___________, they are talking about the difference between annual government expenditures and revenues

a. budget deficit b. balance of trade c. marginal tax bracket d. discount rate