Valori critici per la distribuzione del 
 

G.L.	p = 0,05	p = 0,01	G.L.	p = 0,05	p = 0,01
1	3,841	6,635	22	33,924	40,289
2	5,991	9,210	23	35,172	41,638
3	7,815	11,345	24	36,415	42,980
4	9,488	13,277	25	37,652	44,314
5	11,070	15,086	26	38,885	45,642
6	12,592	16,812	27	40,113	46,963
7	14,067	18,475	28	41,337	48,278
8	15,507	20,090	29	42,557	49,588
9	16,916	21,666	30	43,773	50,892
10	18,307	23,209	40	55,758	63,691
11	19,675	24,725	45	61,656	69,957
12	21,026	26,217	50	67,505	76,154
13	22,362	27,688	55	73,311	82,292
14	23,685	29,141	60	79,082	88,379
15	24,996	30,578	65	84,821	94,422
16	26,296	32,000	70	90,531	100,430
17	27,587	33,409	75	96,217	106,390
18	28,869	34,805	80	101,880	112,330
19	30,144	36,191	85	107,520	118,240
20	31,410	37,566	90	113,150	124,120
21	32,671	38,932	95	118,750	129,970
			100	124,340	135,810