s e n 2 x + c o s 2 x = 1 {\displaystyle sen^{2}x+cos^{2}x=1\,\!}
média: ρ ¯ = 1 n ⋅ ∑ i = 1 n ρ i {\displaystyle {\bar {\rho }}={\frac {1}{n}}\cdot \sum _{i=1}^{n}\rho _{i}}
desvio padrão: σ = ∑ i = 1 n ( ρ i − ρ ¯ ) 2 n − 1 2 {\displaystyle \sigma ={\sqrt[{2}]{\frac {\sum _{i=1}^{n}(\rho _{i}-{\bar {\rho }})^{2}}{n-1}}}}
score z: z = ρ i − ρ ¯ σ {\displaystyle z={\frac {\rho _{i}-{\bar {\rho }}}{\sigma }}}
matriz: [ m ] {\displaystyle {\begin{bmatrix}m\end{bmatrix}}} = [ x y z a b c i j k ] {\displaystyle {\begin{bmatrix}x&y&z\\a&b&c\\i&j&k\end{bmatrix}}}
F a t = μ e . N {\displaystyle F_{at}=\mu _{e}.N\,\!}
![{\displaystyle \sigma ={\sqrt[{2}]{\frac {\sum _{i=1}^{n}(\rho _{i}-{\bar {\rho }})^{2}}{n-1}}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/289c5e57880b46364b86f272945c0f25d8cf8901)
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