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)*(z

_{α/2}/E)^{2}where:

- p: The expected proportion. If you’re unsure, leave this as 0.5.
- z
_{α/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