Examples
Examples
Try the starting example
- Critical z
- 1.96
- Margin of error (proportion)
- 0.05
- Expected proportion
- 0.5
- Required sample size
- 385
Try another scenario
- Critical z
- 2.156
- Margin of error (proportion)
- 0.05
- Expected proportion
- 0.5
- Required sample size
- 465
Calculation method
Calculation method
Required sample size
roundUp(a × a × c × (1-c) ÷ (b × b))
Symbols and units
- a
- Critical z
- b
- Margin of error (proportion)
- c
- Expected proportion
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Calculation steps and notation
roundUp(x) rounds up to the next whole number. Values within two floating-point rounding units of an integer are treated as that integer.
Assumptions & limits
Assumptions & limits
- Large-population simple-random-sample approximation. No finite-population correction or design effect is included.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
Background reading; this does not imply endorsement or independent review of SumFizz.