PSY 429 Experimental Psychology

Table 1

Critical Value of r

 

To see if your correlation coefficient (r) is significant, find the degrees of freedom (N - 2) in the 1st or 4th columns. Determine what alpha level you wish, either .05 or .01, and locate the critical value of r. The obtained correlation coefficient must be GREATER than that value shown in the table for your correlation coefficient to be significant.

 df = N - 2, where N is the number of pairs of scores

Degrees of freedom (df)	Alpha = .05	Alpha = .01	Degrees of freedom (df)	Alpha = .05	Alpha = .01
1	.997	1.000	24	.388	.496
2	.950	.990	25	.381	.487
3	.878	.959	26	.374	.478
4	.811	.917	27	.367	.470
5	.754	.874	28	.361	.463
6	.707	.834	29	.355	.456
7	.666	.798	30	.349	.449
8	.632	.765	35	.325	.418
9	.602	.735	40	.304	.393
10	.576	.708	45	.288	.372
11	.553	.684	50	.273	.354
12	.532	.661	60	.250	.325
13	.514	.641	70	.232	.302
14	.497	.623	80	.217	.283
15	.482	.606	90	.205	.267
16	.468	.590	100	.195	.254
17	.456	.575	125	.174	.228
18	.444	.561	150	.159	.208
19	.433	.549	200	.138	.181
20	.423	.537	300	.113	.148
21	.413	.526	400	.098	.128
22	.404	.515	500	.088	.115
23	.396	.505	1000	.062	.081

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