\documentclass[11pt]{amsart}
\usepackage{geometry}                % See geometry.pdf to learn the layout options. There are lots.
\geometry{letterpaper}                   % ... or a4paper or a5paper or ... 
%\geometry{landscape}                % Activate for for rotated page geometry
%\usepackage[parfill]{parskip}    % Activate to begin paragraphs with an empty line rather than an indent
\usepackage{graphicx}
\usepackage{amssymb}
\usepackage{epstopdf}
\DeclareGraphicsRule{.tif}{png}{.png}{`convert #1 `dirname #1`/`basename #1 .tif`.png}

\usepackage{pstricks, pst-plot, pst-node}
\usepackage{xcolor,soul}



\title{datatest}
%\author{The Author}
%\date{}                                           % Activate to display a given date or no date

\begin{document}
\maketitle

\begin{figure}[h!]
\begin{center}
	\begin{pspicture}(0,0)(5,5)
\savedata{\mydata}{
{0.5,1.0},
{0.75,0.5},
{1.0,1.0},
{1.25	,1.75},
{1.5,1.5},
{1.75,1.75},
{2,2.0},
{2.25	,2.5},
{2.5,	2.25},
{2.75,2.8},
{3,3.3},
{3.25,3.7},
{3.5,	3.75},
{3.75,3.6},
{4,4.25},
{4.25	,3.75},
{4.5,	4.6},
{4.75,4.25},
}

		\fileplot[plotstyle=dots, dotsize=1.5pt]{\mydata}
		\psaxes[Dy=1.0]{->}(5,5)
		\uput[-90](5,0){$x$}
		\uput[0](0,5){$y$}
	
	
	\end{pspicture}
\caption{Least Squares Approximation}
%\label{default}
\end{center}
\end{figure}



\end{document}