Method
n ≈ z²·p·(1−p)/margin².
Sample size for proportions
Estimate sample size for a proportion at a target margin of error.
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Inputs
Change assumptions
How to use it
Use the result as a transparent planning estimate. Change one assumption at a time, compare scenarios and move to Toolkit when you need system-level simulation.
Limits
Approximation assumes simple random sampling and independence.
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Local by design
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