Bias (statistica): differenze tra le versioni

# <math>\sigma = 0.5</math>,

# ''<math>e = 0.05</math>'',

<div align =center><math>n=\frac{N\sigma^{2}Z^{2}_{\alpha}}{e^2(N-1)+\sigma^{2}Z^{2}_{\alpha}}=\frac{{500}\cdot{0.5}^{2}\cdot{1.64}^{2}}{{0.05}^{2}\cdot(500-1)+{0.5}^{2}\cdot{1.64}^{2}}={\frac{338.19}{1.9238}}=175.79</math>

</div>.<br />