[Tex/LaTex] How to use Times New Roman in size 11.5

Question

I always get the following warning:

LaTeX Font Warning: Font shape `OMS/cmsy/m/n' in size <11.5> not available

Answer 1

First of all, cmsy doesn't look like Times New Roman. In order to use this exact font, use the mathptmx package (Times font for both text and math formulae). To use any font size, you need to use Koma Script with scrartcl document class.

MWE

Input:

\documentclass[fontsize=11.5pt]{scrartcl}
%if you want both maths and text in Times New Roman :
\usepackage{mathptmx}
%if you only want text in Times New Roman :
%\usepackage{times}
\usepackage{lipsum} %Blind text

\begin{document}
\lipsum[1-3]
$$SE=\sqrt{\frac{1}{n-2}\left[\sum^{n}_{i=1}(y_i-\overline{y})^2-\frac{\Big[\sum^{n}_{i=1}(x_i-\overline{x})(y_i-\overline{y})\Big]^2}{\sum^{n}_{i=1}(x_i-\overline{x})^2}\right]}$$
\lipsum[1-2]
\end{document}

Output with mathptmx:

Output with times: