I know there is a plenty of resources that deal with tables off the page. And I tried all of them. And they all either do something undesirable, or are not working for me. Please help me position this table in the center of my work AND make the columns less wide.
Thank you!

\documentclass[paper=a4, fontsize=11pt]{scrartcl}
\usepackage[T1]{fontenc}
\usepackage{fourier}
\usepackage[english]{babel} % English language/hyphenation
\usepackage[protrusion=true,expansion=true]{microtype}
\usepackage{amsmath,amsfonts,amsthm}
\usepackage{url}
\usepackage{pgfplots} %for the drawing
\usepackage{chngpage}
\usepackage{sectsty}
\allsectionsfont{\centering \normalfont\scshape}
\usepackage{fancyhdr}
\pagestyle{fancyplain}
\fancyhead{} % No page header
\fancyfoot[L]{} % Empty
\fancyfoot[C]{} % Empty
\fancyfoot[R]{\thepage} % Pagenumbering
\renewcommand{\headrulewidth}{0pt} % Remove header underlines
\renewcommand{\footrulewidth}{0pt} % Remove footer underlines
\setlength{\headheight}{13.6pt}
%%% Equation and float numbering
\numberwithin{equation}{section} % Equationnumbering: section.eq#
\numberwithin{figure}{section} % Figurenumbering: section.fig#
\numberwithin{table}{section} % Tablenumbering: section.tab#
%%% Maketitle metadata
\newcommand{\horrule}[1]{\rule{\linewidth}{#1}} % Horizontal rule
\title{
%\vspace{-1in}
\usefont{OT1}{bch}{b}{n}
\normalfont \normalsize \textsc{XXX: XXX} \\ [5pt]
\normalfont \normalsize \textsc{Dr. XXX XXX} \\ [15pt]
\horrule{0.5pt} \\[0.4cm]
\huge Assignment 2\\
\horrule{2pt} \\[0.5cm]
}
\author{
\normalfont \normalsize
XXX\\[-3pt] \normalsize
\today
}
\date{}
%%% Begin document
\begin{document}
\maketitle
\section*{2.24}
Refer to Copier maintenance Problem 1.20.
a. Set up the basic ANOVA table in the format of Table 2.2. Which elements of your table are additive? Also set up the ANOVA table in the format of Table 2.3. How do the two tables differ?\\\\
%%%%%%
%Attach q2.24table to the end
%%%%%%
\textbf{Answer:}
First, we need to find values that will be used to construct the ANOVA table. Our initial step is taken to construct the following table (you can find the full table at the end of this homework):
\begin{table*} \small
\caption{Data on Copier Maintenance needed for calculation}
\centering
\begin{tabular}{c c c c c c c c c c cc}
\hline\hline
&$X_i$ & $Y_i$ & $X_i-\bar{X}$ & $Y_i-\bar{Y}$ & $\hat{Y_i}$ & $Y_i-\hat{Y_i}$& $(X_i-\bar{X})^2$&$(Y_i-\bar{Y})^2$&$(Y_i-\hat{Y_i})^2$&$\hat{Y_i}-\bar{Y}$&$(\hat{Y_i}-\bar{Y})^2$\\ [0.5ex] % inserts table %heading
\hline
&2&20&-3.11&-56.27&29.48&-9.48&9.68&3165.94&89.87&-46.79&2188.99 \\
&4&60&-1.11&-16.27&59.54&0.46&1.23&264.60&0.21&-16.73&279.78 \\
&$\cdots$ &$\cdots$&$\cdots$&$\cdots$&$\cdots$&$\cdots$&$\cdots$&$\cdots$&$\cdots$&$\cdots$&$\cdots$ \\
&4 & 61 & -1.11&-15.27&59.54&1.46 &1.23& 233.07&2.13&-16.73&279.78\\
&5 & 77 & -0.11 & 0.73&74.57&2.43&0.01&0.54&5.90&-1.70&2.88 \\ [1ex]
\hline
\textbf{Total}&230 &3432 & 0 & 0&3430.80&1.20&340.44&80376.8&3416.41&-1.2&76906.74 \\
\textbf{Mean}&5.11 &76.27 & &&& \\
\hline
\end{tabular}
\label{table:nonlin}
\end{table*}
\end{document}


tabularenclosed with\resizebox{\textwidth}{!}{and}. – hola Sep 20 '14 at 19:51\resizebox...for tables is only a last resort. I would just say, that your table is too large. Think of a landscape/sideway approach – Sep 20 '14 at 20:02