Critical r-values of the correlation coefficient

n

a = 0.05

a = 0.01

4

.950

.999

5

.878

.959

6

.811

.917

7

.754

.875

8

.707

.834

9

.666

.798

10

.632

.765

11

.602

.735

12

.576

.708

13

.553

.684

14

.532

.661

15

.514

.641

16

.497

.623

17

.482

.606

18

.468

.590

19

.456

.575

20

.444

.561

25

.396

.505

30

.361

.463

35

.335

.430

40

.312

.402

45

.294

.378

50

.279

.361

60

.254

.330

70

.236

.305

80

.220

.286

90

.207

.269

100

.196

.256

 

This table is from the text Elementary Statistics by Mario Triola, 4th edition, The Benjamin/Cummings Publishing Company, Inc., 1989