Sample size required to estimate proportion
The formula to estimate the sample size required to estimate the proportion is
$$ n =p*(1-p)\bigg(\frac{z}{E}\bigg)^2 $$
where,
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$p$ is the proportion of success,
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$z$ is the $Z_{\alpha/2}$ (critical value of $Z$),
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$E$ is the margin of error.
