1. Distinguish the two meanings of generalizability

2. Identify the circumstances that make sampling unnecessary and the reasons they are rare

3. Identify the relations among the desired sample, the obtained sample, the sampling frame, and sample quality

4. Define and distinguish the major types of probability sampling method 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 it is affected by the number of cases sampled, the heterogeneity of the population, and the fraction of the population included in the sample