MicrobiologyBytes: Maths & Computers for Biologists: Correlation coefficient Updated: October 15, 2004 Search

Critical Values of the Correlation Coefficient

If your degree of freedom is not on this table, use the value for next lower degree of freedom:

Level of Significance (p) for a Two-Tailed Test
df (n-2):
0.10 0.05 0.02 0.01
1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

35

40

45

50

60

70

80

90

100

0.988

0.900

0.805

0.729

0.669

0.622 

0.582

0.549

0.521

0.497

0.476

0.458

0.441

0.426

0.412

0.400

0.389

0.378

0.369

0.360

0.352

0.344

0.337

0.330

0.323

0.317

0.311

0.306

0.301

0.296

0.275

0.257

0.243

0.231

0.211

0.195

0.183

0.173

0.164

0.997

0.950

0.878

0.811

0.754

0.707

0.666

0.632

0.602

0.576

0.553

0.532

0.514

0.497

0.482

0.468

0.456

0.444

0.433

0.423

0.413

0.404

0.396

0.388

0.381

0.374

0.367

0.361

0.355

0.349

0.325

0.304

0.288

0.273

0.250

0.232

0.217

0.205

0.195

0.9995

0.980

0.934

0.882

0.833

0.789

0.750

0.716

0.685

0.658

0.634

0.612

0.592

0.574

0.558

0.542

0.528

0.516

0.503

0.492

0.482

0.472

0.462

0.453

0.445

0.437

0.430

0.423

0.416

0.409

0.381

0.358

0.338

0.322

0.295

0.274

0.256

0.242

0.230

0.9999

0.990

0.959

0.917

0.874

0.834

0.798

0.765

0.735

0.708

0.684

0.661

0.641

0.623

0.606

0.590

0.575

0.561

0.549

0.537

0.526

0.515

0.505

0.496

0.487

0.479

0.471

0.463

0.456

0.449

0.418

0.393

0.372

0.354

0.325

0.303

0.283

0.267

0.254

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