`\documentclass[10pt]{article}
\usepackage{pgf,tikz}
\usetikzlibrary{arrows}
\pagestyle{empty}
\begin{document}
\begin{tikzpicture}[x=1cm,y=5cm][line cap=round,line join=round,>=triangle 45,x=1.0cm,y=1.0cm]
\draw[->,color=black] (-4.4787,0) — (4.494,0);
\foreach \x in {-4,-3,-2,-1,0,1,2,3,4}
\draw[shift={(\x,0)},color=black] (0pt,2pt) — (0pt,-2pt) node[below] {\footnotesize $\x$};
\clip(-4.4787,-0.4111) rectangle (5.494,0.575);
\draw[fill=black,fill opacity=0.1, smooth,samples=50,domain=-2.58:2.58] plot(\x,{exp(-(\x)^2/2)/sqrt(2*pi)}) — (2.58,0) — (-2.58,0) — cycle;
\draw[smooth,samples=100,domain=-4.478660464569973:5.493990767592388] plot(\x,{exp(-(\x)^2/2)/sqrt(2*pi)});
\draw (-1.4785,0.580) node[anchor=north west] {Zona di accettazione};
\draw [->,line width=1.2pt] (0,0.5) — (0,0.4122);
\draw (1.5141,0.2737) node[anchor=north west] {Zona di rifiuto};
\draw [->,line width=1.2pt] (3.6492,0.1821) — (3.013,0.0365);
\draw (2.6034,-0.1513) node[anchor=north west] {z critico 2.58};
\draw [->] (3.1959,-0.1278) — (2.5889,-0.0089);
\draw (-4,0.2737) node[anchor=north west] {Zona di rifiuto};
\draw [->,line width=1.2pt] (-3.6492,0.1821) — (-3.013,0.0365);
\draw (-4,-0.1294) node[anchor=north west] {z critico -2.58};
\draw [->] (-3.1056,-0.1137) — (-2.607,-0.0136);
\begin{scriptsize}
\draw (0,0.14) node {$1-\alpha = 0.9901$};
\end{scriptsize}
\end{tikzpicture}
\end{document}`
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