\begin{table}[htb]
%\begin{center}
%\hspace*{-2.3cm}
%\hspace*{-1.3cm}
  \centerline{
\begin{tabular}{|c|c|c|c|c|}
\hline
 {\small Distribuci\'on}&{\small Par\'ametro}&{\small Casos}&\multicolumn{2}{|c|}{\small Intervalo} \\
 \hline \hline
%
 &&$\begin{array}{c}\sigma_1,\sigma_2\\ \mbox{conocidas}\end{array}$&\multicolumn{2}{|c|}{$(\med{x}_1-\med{x}_2)\pm \perb{Z}\sqrt{\fra{\sigma_1^2}{n_1}+\fra{\sigma_2^2}{n_2}}$}\\ \cline{3-5}
 $\begin{array}{c}\mbox{Normales}\\\mbox{Indep.}\\ {\cal N}(\mu_1,\sigma_1^2)\\ {\cal N}(\mu_2,\sigma_2^2)\end{array}$&
       $\mu_{1}-\mu_{2}$&$\begin{array}{c}\sigma_1=\sigma_2\\ \mbox{desconocidas}\end{array}$&\multicolumn{2}{|c|}{$\begin{array}{c}\med{x}_1\!-\!\med{x}_2\pm\pdb{t}{m}S_{p}\sqrt{\frac{1}{n_1}\!+\!\frac{1}{n_2}}\\ \mbox{\small con $m=n_1+n_2-2$} \\ S^2_{p}=\fra{(n_1-1)S_{c_1}^2+(n_2-1)S_{c_2}^2}{n_1+n_2-2}\end{array}$}\\\cline{3-5}
  &&$\begin{array}{c}\sigma_1 \neq \sigma_2\\\mbox{desconocidas}\end{array}$&\multicolumn{2}{|c|}{$\begin{array}{c}\med{x}_1-\med{x}_2 \pm \pdb{t}{a}\sqrt{\fra{S_{c_1}^2}{n_1}+\fra{S_{c_2}^2}{n_2}}\\a=\fra{\left(S^2_{c_1}/n_1+S^2_{c_2}/n_2\right)^2}{\fra{\left(S^2_{c_1}/n_1\right)^2}{n_1+1}+\fra{\left(S^2_{c_2}/n_2\right)^2}{n_2+1}}-2\end{array}$}\\
  \hline
%
  $\begin{array}{c}\mbox {Normales}\\\mbox{Depen.}\end{array}$&$\begin{array}{c}\\ \mu_1-\mu_2\end{array}$&$\begin{array}{c}\sigma_d\\\mbox{conocida}\end{array}$&\multicolumn{2}{|c|}{$\med{d}\pm\perb{Z}\fra{\sigma_d}{\sqrt{n}}\quad\med{d}=\med{x}_1-\med{x}_2$}\\ \cline{3-5}
  $\begin{array}{c}{\cal N}(\mu_1,\sigma_1^2)\\ {\cal N}(\mu_2,\sigma_2^2)\end{array}$&&$\rule[-4mm]{0mm}{12mm}\begin{array}{c}\sigma_d\\\mbox{desconocida}\end{array}$&$\begin{array}{c}n<30\\\med{d}\pm\pdb{t}{n-1}\fra{S_{c_d}}{\sqrt{n}}\end{array}$&$\begin{array}{c}n\geq 30\\\med{d}\pm\perb{Z}\fra{S_{c_d}}{\sqrt{n}}\end{array}$\\
  \hline
%
  $\begin{array}{c}\mbox {Normales}\\{\cal N}(\mu_1,\sigma_1^2)\\ {\cal N}(\mu_2,\sigma_2^2)\end{array}$&$\fra{\sigma_1^2}{\sigma_2^2}$&$\begin{array}{c}\mu_1,\mu_2\\ \mbox{desconocidas}\end{array}$&\multicolumn{2}{|c|}{$\left(\fra{S^2_{c_1}/S^2_{c_2}}{\pdb{F}{n_1-1,n_2-1}},\fra{S^2_{c_1}/S^2_{c_2}}{\pda{F}{n_1-1,n_2-1}}\right)$} \\
  \hline
%
  $\begin{array}{c}\mbox{Bernoulli}\\ {\cal B}(p_1)\\ {\cal B}(p_2)\end{array}$&$p_1-p_2$&
       $\begin{array}{c}n_1\med{x}_1,n_2\med{x}_2\\n_1(1-\med{x}_1)\\n_2(1-\med{x}_2)\\n_1p_1,n_2p_2\\n_1q_1,n_2q_2 \geq 5\end{array}$&
       \multicolumn{2}{|c|}{$\begin{array}{cc}\multicolumn{2}{c}{(\hat{p}_1-\hat{p}_2)\pm\perb{Z}\sqrt{\fra{\hat{p}_1\hat{q}_1}{n_1}+\fra{\hat{p}_2\hat{q}_2}{n_2}}}\\\hat{p}_1=\med{x_1}&\hat{p}_2=\med{x_2}\\\hat{q}_1=1-\med{x_1}&\hat{q}_2=1-\med{x_2}\end{array}$} \\ \hline
\end{tabular}
}
\caption{Intervalos de confianza para dos poblaciones}
\label{t_inter_ii}
\end{table}