Understanding sampling methods, distributions, and statistical inference
What is sample size determination?
The process of calculating the minimum sample size needed to achieve desired precision and power.
Example: For ±3% margin of error with 95% confidence and p = 0.5: n = (1.96)² × 0.25 / 0.03² ≈ 1068
Note: Must specify: desired margin of error, confidence level, expected variability; for unknown p, use p = 0.5 (most conservative)
