The sample size required to estimate a population proportion with a certain level of confidence and a desired margin of error is calculated as:
Sample size = p*(1-p)*(zα/2/E)2
- p: The expected proportion. If you’re unsure, leave this as 0.5.
- zα/2: The z critical value
- E: The desired margin of error
To find the sample size required to estimate a population proportion, simply fill in the boxes below and then click the “Calculate” button.
Sample Size: 1068