Exam 6: Sampling

The cases or observations selected in nonprobability sampling may provide a basis for statistical inference.

A stratified random sample reduces error when

You need a sample of twenty-five students to interview for a study of attitudes toward intercollegiate athletics, and so you interview the first twenty-five students to enter the campus center on a Monday morning. What kind of sample is this?

Systematic sampling is the most basic sampling design and is found in the more complex designs such as stratified sampling.

To calculate the margin of error of a sample estimate, you must know all but which one of the following?

Network sampling and snowball sampling are recommended when

Which of the following principles applies to probability sampling?

Suppose a student doing a telephone survey for the campus newspaper asks you, "How big a sample do I need to get accurate results?" Which of the following would be the best advice you could offer?

Incomplete sampling frames generally result in random as opposed to systematic sampling error.

If you used the campus directory to sample students on your campus, all students listed in the directory would be the sampling frame.

Suppose you are working with the vice squad in your city to conduct an interview study of female prostitutes. Which of the following sampling designs would be best to select your interviewees?

To study how satisfied Americans are with the electoral process, a social scientist conducts a mail questionnaire survey. First he obtains a list of all political precincts in the United States (which covers all areas of the United States) and randomly selects a number of precincts from this list. He then obtains a list of registered voters for each selected precinct, and from each list he selects a random sample of voters. Finally, he mails each selected voter a survey in which he asks questions about their satisfaction with the electoral process. a. What type of sampling design is this? b. There are two sampling frames. What are they? c. Carefully evaluate the adequacy of each frame in terms of meeting the objective of the study-to assess Americans' satisfaction with the electoral process?

Which of the following considerations is least important in determining sample size?

Which of the following nonprobability sampling designs most closely resembles stratified random sampling?

If the researcher is unable to obtain a list of the population or members of the population cannot be identified easily, then he or she must use a

Which type of sampling design uses probability proportionate to size sampling?

When pollsters conduct telephone polls, they typically use random-digit dialing; however, some people refuse to cooperate and answer the questions, and others are not at home when called. This results (or may result) in

Random selection produces random sampling error.

Proportionate stratified sampling requires that the same number of cases be drawn from each stratum.

In probability sampling, which of the following results in random sampling error?