\documentstyle[x2000,helv]{article}
% you must use dvips -x2000 to get the slide size
% the helv font is not required, but to use it you need helv.sty
\setlength{\textheight}{4.5in}  % x2000 sets this to 3in,
                                % but that's often not quite enough.
\parindent 0in
\setlength{\topmargin}{-.2in}
\setlength{\headsep}{0in}
\setlength{\parskip}{8pt}       % extra space between paragraphs
\pagestyle{empty}
\renewcommand{\baselinestretch}{2.0}
\def\wh{\widehat}               % just simplifies typing
\def\wb{\overline}
\def\wt{\widetilde}

\begin{document}

{\bf Approx. Confidence Interval for Pop. Mean $\mu$:}
\[ \wb{X}-z_{\alpha/2}\mbox{se}(\wb{X})<\mu<
  \wb{X}+z_{\alpha/2}\mbox{se}(\wb{X})   \]
\[ \overline{X}-z_{\alpha/2}\frac{s}{\sqrt{n}}<\mu<
  \wb{X}+z_{\alpha/2}\frac{s}{\sqrt{n}}  \]

{\bf General C.I. for Estimator $\wh{\theta}$}
\[ \wh{\theta}-z_{\alpha/2}\mbox{se}(\wh{\theta})<\theta<
   \wh{\theta}+z_{\alpha/2}\mbox{se}(\wh{\theta}) \]

se($\wh{\theta}$) = standard error of $\wh{\theta}$ \\
= estimated standard deviation of $\wh{\theta}$


\end{document}