t - tables : Probability of a larger absolute value (two tailed test)

d.f.

0.500

0.400

0.300

0.200

0.100

0.050

0.020

0.010

0.002

0.001

d.f.

1

1.000

1.376

1.963

3.078

6.314

12.706

31.821

63.656

318.289

636.578

1

2

0.816

1.061

1.386

1.886

2.920

4.303

6.965

9.925

22.328

31.600

2

3

0.765

0.978

1.250

1.638

2.353

3.182

4.541

5.841

10.214

12.924

3

4

0.741

0.941

1.190

1.533

2.132

2.776

3.747

4.604

7.173

8.610

4

5

0.727

0.920

1.156

1.476

2.015

2.571

3.365

4.032

5.894

6.869

5

6

0.718

0.906

1.134

1.440

1.943

2.447

3.143

3.707

5.208

5.959

6

7

0.711

0.896

1.119

1.415

1.895

2.365

2.998

3.499

4.785

5.408

7

8

0.706

0.889

1.108

1.397

1.860

2.306

2.896

3.355

4.501

5.041

8

9

0.703

0.883

1.100

1.383

1.833

2.262

2.821

3.250

4.297

4.781

9

10

0.700

0.879

1.093

1.372

1.812

2.228

2.764

3.169

4.144

4.587

10

11

0.697

0.876

1.088

1.363

1.796

2.201

2.718

3.106

4.025

4.437

11

12

0.695

0.873

1.083

1.356

1.782

2.179

2.681

3.055

3.930

4.318

12

13

0.694

0.870

1.079

1.350

1.771

2.160

2.650

3.012

3.852

4.221

13

14

0.692

0.868

1.076

1.345

1.761

2.145

2.624

2.977

3.787

4.140

14

15

0.691

0.866

1.074

1.341

1.753

2.131

2.602

2.947

3.733

4.073

15

16

0.690

0.865

1.071

1.337

1.746

2.120

2.583

2.921

3.686

4.015

16

17

0.689

0.863

1.069

1.333

1.740

2.110

2.567

2.898

3.646

3.965

17

18

0.688

0.862

1.067

1.330

1.734

2.101

2.552

2.878

3.610

3.922

18

19

0.688

0.861

1.066

1.328

1.729

2.093

2.539

2.861

3.579

3.883

19

20

0.687

0.860

1.064

1.325

1.725

2.086

2.528

2.845

3.552

3.850

20

21

0.686

0.859

1.063

1.323

1.721

2.080

2.518

2.831

3.527

3.819

21

22

0.686

0.858

1.061

1.321

1.717

2.074

2.508

2.819

3.505

3.792

22

23

0.685

0.858

1.060

1.319

1.714

2.069

2.500

2.807

3.485

3.768

23

24

0.685

0.857

1.059

1.318

1.711

2.064

2.492

2.797

3.467

3.745

24

25

0.684

0.856

1.058

1.316

1.708

2.060

2.485

2.787

3.450

3.725

25

26

0.684

0.856

1.058

1.315

1.706

2.056

2.479

2.779

3.435

3.707

26

27

0.684

0.855

1.057

1.314

1.703

2.052

2.473

2.771

3.421

3.689

27

28

0.683

0.855

1.056

1.313

1.701

2.048

2.467

2.763

3.408

3.674

28

29

0.683

0.854

1.055

1.311

1.699

2.045

2.462

2.756

3.396

3.660

29

30

0.683

0.854

1.055

1.310

1.697

2.042

2.457

2.750

3.385

3.646

30

32

0.682

0.853

1.054

1.309

1.694

2.037

2.449

2.738

3.365

3.622

32

34

0.682

0.852

1.052

1.307

1.691

2.032

2.441

2.728

3.348

3.601

34

36

0.681

0.852

1.052

1.306

1.688

2.028

2.434

2.719

3.333

3.582

36

38

0.681

0.851

1.051

1.304

1.686

2.024

2.429

2.712

3.319

3.566

38

40

0.681

0.851

1.050

1.303

1.684

2.021

2.423

2.704

3.307

3.551

40

45

0.680

0.850

1.049

1.301

1.679

2.014

2.412

2.690

3.281

3.520

45

50

0.679

0.849

1.047

1.299

1.676

2.009

2.403

2.678

3.261

3.496

50

75

0.678

0.846

1.044

1.293

1.665

1.992

2.377

2.643

3.202

3.425

75

100

0.677

0.845

1.042

1.290

1.660

1.984

2.364

2.626

3.174

3.390

100

0.674

0.842

1.036

1.282

1.645

1.960

2.326

2.576

3.090

3.290

d.f.

0.250

0.200

0.150

0.100

0.050

0.025

0.010

0.005

0.001

0.0005

d.f.

t - tables : Probability of a larger value (one tailed test)