📊 Single Proportion Sample Size Calculator
This calculator helps researchers determine the minimum sample size required to estimate a single population proportion with a specified confidence level and margin of error.
Minimum required sample size (n):
🧮 How to Use This Calculator
To use this calculator:
- Enter the estimated population proportion (e.g. 0.5 if unknown).
- Enter the desired margin of error (e.g. 0.05 for ±5%).
- Select your desired confidence level (usually 95%).
- Click "Calculate Sample Size".
This is commonly used in health, education, and social science research when estimating the prevalence or proportion of a characteristic in a population (e.g. % of smokers, % with a disease).
📚 Reference
Lwanga, S.K. & Lemeshow, S. (1991). Sample Size Determination in Health Studies: A Practical Manual. World Health Organization.
https://apps.who.int/iris/handle/10665/40062
Keywords: sample size calculator, single proportion, population proportion, margin of error, confidence level, health research, Malaysia, WHO, Lwanga Lemeshow, blogspot stats tool
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