Question: 1. Distinguish between probability sampling and nonprobability sampling. 2. What is a simple random sample? What is the central difficulty involved in obtaining simple random

1. Distinguish between probability sampling and nonprobability sampling. 2. What is a simple random sample? What is the central difficulty involved in obtaining simple random samples from large populations? 3. What type of sample is used most frequently in behavioral research? Why? 4. Define external validity

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