\documentclass[12pt,letterpaper]{report}
\usepackage[plain]{nccfancyhdr}
\usepackage[compact]{titlesec}
\usepackage{sectsty}
\sectionfont{\normalsize}%change section font size from \Large to \normalsize
\subsectionfont{\normalsize}
\subsubsectionfont{\normalsize}
\usepackage[total={6.0in,8.625in},
top=1.25in, left=1.5in, headsep=0.25in, headheight=14.5pt]{geometry}
\setcounter{secnumdepth}{3}
\setcounter{tocdepth}{3}
\setlength{\emergencystretch}{5pt}%5pt DO NOT LET WORDS GO INTO MARGIN!!!
\usepackage{setspace}
\usepackage[sort&compress]{natbib} %this stuff
\bibliographystyle{unsrt}
\renewcommand\bibsection{{\noindent\normalfont\bfseries\Large References}}
\newcommand\bibpreamble{\vspace{1.03cm}}
\usepackage{latexsym}%11 extra symbols
\usepackage{rotating}%for sideways tables
\usepackage{times}
%\usepackage[garamond]{mathdesign}
\usepackage{amsmath,bm}
\usepackage{mathbbol}
\usepackage{verbatim}%needed for verbatim environment used in appendicies
\usepackage{moreverb}%needed for listing environment used in appendicies, same as verbatim but with line #s
\pagestyle{fancy}
\titleformat{\chapter}{\normalfont\bfseries\Large}{Chapter \thechapter.}{.7em}{}
%\titleformat{\chapter}{\normalfont\Huge\bfseries}{\thechapter}{20pt}{\Huge}
\newpagestyle{main}{%
\fancyhf{} %delete the current section for header and footer
\fancyhead[r]{\thepage}
\renewcommand{\headrulewidth}{0.pt}
%\fancypagestyle{plain}{}
}