1. Identify the circumstances the make sampling unnecessary and the reason they are rare.

2. Identify the relation between the desired sample, the obtained sample, the sampling frame, and sample

quality.

3. Define and distinguish probability and nonprobability sampling and both techniques’ relationship to

sample generalizability.

4. Define the major types of probability sampling and indicate when each is preferred.

5. Explain when nonprobability sampling methods may be preferred.

6. Describe the concept of sampling error and explain how its size is affected by the heterogeneity of the

population and the fraction of population included in the sample.