documentclass[11pt]{article}
usepackage[vmargin=1.25in,hmargin=1.5in]{geometry}
usepackage{times}               % Times Roman
usepackage[scaled=0.86]{helvet} % Helvetica

usepackage{sectsty}
sectionfont{largesffamily}
%usepackage[nosectionbib]{apacite}
usepackage[nosectionbib,numberedbib]{apacite}
AtBeginDocument{renewcommandrefname{REFERENCES}}
begin{document}
raggedright

hrule
begin{center}
hugebfseriessffamily Title is using arial
end{center}
hrule

section*{ABSTRACT now uses arial}

Correctly using Times Roman

section{INTRODUCTION now uses arial}

Correctly using Times Roman


end{document}