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Design robust RCT with appropriate statistical power. Study design: 1. Define primary outcome clearly (e.g., change in depression score). 2. Choose randomization method (simple, block, stratified). 3. Blinding strategy (single, double, triple-blind where possible). 4. Control group selection (placeb...
Design appropriate sampling strategy and calculate required sample size. Sampling methods: 1. Probability sampling: simple random, systematic, stratified, cluster sampling. 2. Non-probability sampling: convenience, purposive, snowball, quota sampling. 3. Mixed methods: sequential explanatory require...
