Margin of Error and Required Sample Size

What this note covers

1. The Confidence Interval for a Population Proportion
2. Computing the Margin of Error from a Given Sample
3. Rearranging the Formula to Find Minimum Required Sample Size
4. The Inverse-Square Relationship Between n and M
5. Justifying Whether a Survey Design Meets Precision Requirements
6. Using a Prior Estimate to Reduce Required Sample Size
7. Conditions for Validity and Australian Survey Practice

7 sections · 14 key terms & formulas · 6 common mistakes