Question 1: Distinguish between:

1. Statistic and parameter.

2. Sample frame and population.

3. Restricted and unrestricted sampling.

4. Simple random and complex random sampling.

5. Convenience and purposive sampling.

6. Sample precision and sample accuracy.

7. Systematic and error variance.

8. Variable and attribute parameters.

9. Proportionate and disproportionate samples.

Question 2: Under what kind of conditions would you recommend:

1. A probability sample? a nonprobability sample?

2. A simple random sample? a cluster sample? a stratified sample?

3. A disproportionate stratified probability sample?

Question 3: You plan to conduct a survey using unrestricted sampling. What subjective decisions must you make?

Question 4: Describe the differences between a probability sample and a nonprobability sample.

Question 5: Why would a researcher use a quota purposive sample?