Exam 4: Sampling, How to Select a Few to Represent the Many

What is random-digit dialing?

The most representative samples do not use a random selection process.

A proper sample allows researchers to study features of the population from which it came.

In sampling a hidden population,a researcher would use what type of sampling?

______________________is a term meaning without being systematic; a carefree Ȉanything goesȈ selection method.

The___________the homogeneity (or the less the diversity),the smaller its sampling error.

______________________samples possible telephone numbers using computer-based random sampling.

Dr.Van Offer has a very large sample with very little diversity among cases,so his sampling error will be

One limitation of this type of sampling is that the researcher only captures the diversity of a few predetermined population characteristics.

List and describe four types of randomized sampling techniques.

Dr.Van Offer has proposed a study of a population with Hepatitis C,a blood/liver disease that is transmitted through contact with bodily fluids (sexual contact,sharing needles,etc.).Since he does not have access to medical records because of confidentiality,how will he ȈfindȈ this population,i.e.what type of sampling techniques might he use? What is this kind of population called? Give two other examples of this type of population.

______________________sampling is appropriate when a researcherȇs goal is other than getting representative sample of an entire population.The researcher uses many diverse means to select units that fit very specific characteristics.

Accidental sampling occurs when a researcher selects cases that are easy and convenient.It lacks depth and is also called

A random sampling distribution curve is in the shape of

A researcher might use purposive sampling by

This type of population includes people who engage in concealed activities and is called .

Probability samples are the same as___________.

The crucial feature in snowball sampling is that each person or case has a___________with one another.

Qualitative researchers rarely use random sampling because they often have different goals than to get a representative sample of a large population.

If a researcher wants to sample a very small target population,he might as well