documentclass[]{article}
usepackage[margin=0.5in]{geometry}
usepackage{pgfplots}
renewcommand{thesection}{arabic{section}}
usepackage{mathtools}
usepackage{cancel}
usepackage{pgfplots}
usepackage{amsmath}
newtheorem{theorem}{THEOREM}
newtheorem{proof}{PROOF}
usepackage{tikz}
usepackage{amssymb}
usetikzlibrary{patterns}
usepackage{fancyhdr}
usepackage{bigints}
usepackage{color}
usepackage{tcolorbox}
usepackage{color,xcolor}
usepackage{booktabs,array}
usepackage{hyperref}
usepackage{graphicx}
usetikzlibrary{arrows}
usepackage{polynom}
usepackage{wallpaper}
usetikzlibrary{shapes.geometric}
usepgfplotslibrary{fillbetween}
usepgfplotslibrary{statistics}
newenvironment{tightcenter}{
setlengthtopsep{0pt}
setlengthparskip{0pt}
begin{center}}{end{center}}
begin{document}
begin{tikzpicture}
begin{axis}
[
axis lines=middle,
xmajorticks=true,
ytick=empty,
xtick=empty,
xmin=500,
xmax=8000,
%xtick={1000,3000,4000,5000,6000,7000,8000},
xtick={1000,2000,3000,4000,5000,6000,7000,8000},
%axis x line=bottom,
axis line style={-},
axis y line=none,
enlargelimits=0.05,
height=3.2cm,
width=17cm,
clip=false
]
addplot[
opacity=100,
boxplot prepared={
median=5750,
upper quartile=6500,
lower whisker=500,
lower quartile=4500,
upper whisker=8000,
whisker extend=0 % height of whiskers
},black
] coordinates {};
%
end{axis}
end{tikzpicture}

end{document}