digraph G {
	rankdir=TB;
	ranksep=0.2;
	node [fontsize=12, shape=rectangle, style=filled, nodesep=0.75,ranksep=0.75];
        edge [penwidth=2, fontsize=10 ];


	data[label="type of data?"];
	IR[label="data normal distributed\nor n large?"];
	ordinal[label="1, 2, or >2 groups?",color="lightblue"];
	nominal[label="?"];
			 
	data->IR[label="interval/ratio"];
	data->nominal[label="nominal/discrete"];
	data->ordinal[label="ordinal"];

	normal[label="1, 2, or >2 groups?"];
	notnormal[label="transform into\nnormal?"];
	trulynotnormal[label="1, 2, or >2 groups?",color="lightblue"];

	IR->normal[label="normal"];
	IR->notnormal[label="not normal"];
	notnormal->normal[label="yes"];
	notnormal->trulynotnormal[label="no"];

	onesamp[label="one-sample\nt-test"];
	normal->onesamp[label="1 group"];


	twosamp[label="paired or\nindependent?"];
	pairedttest[label="paired\nt-test"];
	normal->twosamp[label="2 groups"];
	twosamp->pairedttest[label="paired"];

	twosampNN[label="paired or\nindependent?",color="lightblue"];
	indepTwosampNN[label="Wilcoxon-Mann-Whitney\ntest",color="lightblue"];

	trulynotnormal->twosampNN[label="2 groups"];
	twosampNN->indepTwosampNN[label="independent"];
	
	twosampOrd[label="paired or\nindependent?",color="lightblue"];
	ordinal->twosampOrd[label="2 groups"];
	twosampOrd->indepTwosampNN[label="independent"];

	

}