\documentclass[crop,tikz,convert=pdf2svg]{standalone}

% Tikz settings optimized for causal graphs.
\usetikzlibrary{shapes,decorations,arrows,calc,arrows.meta,fit,positioning}
\tikzset{
    -Latex,auto,node distance =1 cm and 1 cm,semithick ,
    state/.style ={ellipse, draw, minimum width = 0.7 cm},
    point/.style = {circle, draw, inner sep=0.04cm,fill,node contents={}},
    bidirected/.style={Latex-Latex,dashed},
    el/.style = {inner sep=2pt, align=left, sloped}
}

\begin{document}

% The graph
\begin{tikzpicture}
    \node (1) at (0,0) {Proximity};
    \node (2) [right = of 1] {Tutoring};
    \node (3) [right = of 2] {GPA};
    \node (4) [below = of 2] {Library};

    \path (1) edge  (2);
    \path (2) edge (3);
    \path[bidirected] (2) edge[bend left=50]  (3);
    \path (4) edge (3);
    \path (1) edge (4);
\end{tikzpicture}

\end{document}