What is the primary distinction between random assignment and purposive sampling in group research?

• A. Random assignment distributes participants randomly.
• B. Purposive sampling distributes participants randomly.
• C. Random assignment selects individuals with specific characteristics.
• D. Purposive sampling ignores participant characteristics.

Answer: (A)

The main idea here is how participants are handled after you have them: allocation to groups versus selection of who to include. Random assignment distributes participants to experimental and control groups purely by chance, which helps make the groups comparable on other variables and supports causal conclusions. Purposive sampling, on the other hand, selects participants who have specific characteristics to study a particular subgroup, and it does not aim to randomize group placement. This approach shapes the sample to fit the research question, which can limit how well findings generalize to a broader population. So the best answer focuses on distributing participants randomly into groups.