The formula is:
\[ n = \left( \frac{Z^2 \cdot p \cdot (1 - p)}{E^2} \right) \]
where:
- \( n \) is the sample size,
- \( Z \) is the Z-value corresponding to the desired confidence level,
- \( p \) is the estimated proportion of the population,
- \( E \) is the
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