\begin{table}[htb]
%\begin{center}
%\hspace*{-2.3cm}
%\hspace*{-1.3cm}
  \centerline{
\begin{tabular}{|c|c|c|c|c|}
   \hline
   \small Distribuci\'on&Par\'ametro&\multicolumn{1}{c}{\small Casos}&\multicolumn{2}{|c|}{\small Intervalo}\\
   \hline \hline
   \begin{tabular}{c}\\ Normal\\ ${\cal N}(\mu,\sigma^2)$\end{tabular}&
   $\begin{array}{c}\\\mu\end{array}$&$\sigma\mbox{ conocida}$&\multicolumn{2}{|c|}{$\med{x}\pm\perb{Z}\fra{\sigma}{\sqrt{n}}$}\\ \cline{3-5}
   &&$\sigma$ desconocida&$\begin{array}{c}n<30\\\med{x}\pm\pdb{t}{n-1}\fra{S_c}{\sqrt{n}}\end{array}$&
   $\begin{array}{c}n\geq 30\\\med{x}\pm\perb{Z}\fra{S_c}{\sqrt{n}}\end{array}$\\
   \hline
%
   \begin{tabular}{c}\\ Desconocida\\ $n\ge 30$ \end{tabular}&
   $\begin{array}{c}\\\mu\end{array}$&$\sigma\mbox{ conocida}$&\multicolumn{2}{|c|}{$\med{x}\pm\perb{Z}\fra{\sigma}{\sqrt{n}}$}\\ \cline{3-5}
   &&$\sigma\mbox{ desconocida}$&\multicolumn{2}{|c|}{$\med{x}\pm\perb{Z}\fra{S_c}{\sqrt{n}}$}\\
   \hline
%
   \begin{tabular}{c}Bernoulli \\ ${\cal B}(p)$ \end{tabular}&$p$&\begin{tabular}{c}Muestras\\ grandes\end{tabular}&
   \multicolumn{2}{|c|}{$\begin{array}{cc}\multicolumn{2}{c}{\hat{p}\pm\perb{Z}\sqrt{\fra{\hat{p}\hat{q}}{n}}}\\\hat{p}=\med{x}&\hat{q}=1-\med{x}\end{array}$}\\
   \hline
%
   \begin{tabular}{c} Normal\\ ${\cal N}(\mu,\sigma^2)$\end{tabular}&$\begin{array}{c}\\\\\sigma^2\end{array}$&$\mu\mbox{ conocida}$&\multicolumn{2}{|c|}{$\begin{array}{c}\left({\fra{nS_\mu^2}{\pdb{\chi^2}{n}},\fra{nS_\mu^2}{\pda{\chi^2}{n}}}\right)\\
   S_\mu^2=\fra{\sum_{i=1}^n{(x_i-\mu)^2}}{n}\end{array}$}\\ \cline{3-5}
   &&$\mu$ desconocida&\multicolumn{2}{|c|}{$\left({\fra{(n-1)S_c^2}{\pdb{\chi^2}{n-1}},\fra{(n-1)S_c^2}{\pda{\chi^2}{n-1}}}\right)$}\\
   \hline
%
   \begin{tabular}{c}Poisson\\ ${\cal P}(\lambda)$\end{tabular}&$\lambda$&$\begin{array}{c}\mbox{Muestras}\\\mbox{grandes}\end{array}$&\multicolumn{2}{|c|}{$\med{x} \pm \perb{Z}\sqrt{\fra{\med{x}}{n}}$}\\
   \hline
\end{tabular}
}
\caption{Intervalos de confianza para una poblaci\'on}\label{t_inter_i}
\end{table}