t检验（t-test）临界值表（临界置信水平）

n’

P(2):

0.5

0.2

0.1

0.05

0.02

0.01

0.005

0.002

P(1):

0.25

0.1

0.05

0.025

0.01

0.005

0.0025

0.001

1

1

3.078

6.314

12.706

31.821

63.657

127.321

318.309

2

0.816

1.886

2.92

4.303

6.965

9.925

14.089

22.327

3

0.765

1.638

2.353

3.182

4.541

5.841

7.453

10.215

4

0.741

1.533

2.132

2.776

3.747

4.604

5.598

7.173

5

0.727

1.476

2.015

2.571

3.365

4.032

4.773

5.893

6

0.718

1.44

1.943

2.447

3.143

3.707

4.317

5.208

7

0.711

1.415

1.895

2.365

2.998

3.499

4.029

4.785

8

0.706

1.397

1.86

2.306

2.896

3.355

3.833

4.501

9

0.703

1.383

1.833

2.262

2.821

3.25

3.69

4.297

10

0.7

1.372

1.812

2.228

2.764

3.169

3.581

4.144

11

0.697

1.363

1.796

2.201

2.718

3.106

3.497

4.025

12

0.695

1.356

1.782

2.179

2.681

3.055

3.428

3.93

13

0.694

1.35

1.771

2.16

2.65

3.012

3.372

3.852

14

0.692

1.345

1.761

2.145

2.624

2.977

3.326

3.787

15

0.691

1.341

1.753

2.131

2.602

2.947

3.286

3.733

16

0.69

1.337

1.746

2.12

2.583

2.921

3.252

3.686

17

0.689

1.333

1.74

2.11

2.567

2.898

3.222

3.646

18

0.688

1.33

1.734

2.101

2.552

2.878

3.197

3.61

19

0.688

1.328

1.729

2.093

2.539

2.861

3.174

3.579

20

0.687

1.325

1.725

2.086

2.528

2.845

3.153

3.552

21

0.686

1.323

1.721

2.08

2.518

2.831

3.135

3.527

22

0.686

1.321

1.717

2.074

2.508

2.819

3.119

3.505

23

0.685

1.319

1.714

2.069

2.5

2.807

3.104

3.485

24

0.685

1.318

1.711

2.064

2.492

2.797

3.091

3.467

25

0.684

1.316

1.708

2.06

2.485

2.787

3.078

3.45

26

0.684

1.315

1.706

2.056

2.479

2.779

3.067

3.435

27

0.684

1.314

1.703

2.052

2.473

2.771

3.057

3.421

28

0.683

1.313

1.701

2.048

2.467

2.763

3.047

3.408

29

0.683

1.311

1.699

2.045

2.462

2.756

3.038

3.396

30

0.683

1.31

1.697

2.042

2.457

2.75

3.03

3.385

31

0.682

1.309

1.696

2.04

2.453

2.744

3.022

3.375

32

0.682

1.309

1.694

2.037

2.449

2.738

3.015

3.365

33

0.682

1.308

1.692

2.035

2.445

2.733

3.008

3.356

34

0.682

1.307

1.091

2.032

2.441

2.728

3.002

3.348

35

0.682

1.306

1.69

2.03

2.438

2.724

2.996

3.34

36

0.681

1.306

1.688

2.028

2.434

2.719

2.99

3.333

37

0.681

1.305

1.687

2.026

2.431

2.715

2.985

3.326

38

0.681

1.304

1.686

2.024

2.429

2.712

2.98

3.319

39

0.681

1.304

1.685

2.023

2.426

2.708

2.976

3.313

40

0.681

1.303

1.684

2.021

2.423

2.704

2.971

3.307

50

0.679

1.299

1.676

2.009

2.403

2.678

2.937

3.261

60

0.679

1.296

1.671

2

2.39

2.66

2.915

3.232

70

0.678

1.294

1.667

1.994

2.381

2.648

2.899

3.211

80

0.678

1.292

1.664

1.99

2.374

2.639

2.887

3.195

90

0.677

1.291

1.662

1.987

2.368

2.632

2.878

3.183

100

0.677

1.29

1.66

1.984

2.364

2.626

2.871

3.174

200

0.676

1.286

1.653

1.972

2.345

2.601

2.839

3.131

500

0.675

1.283

1.648

1.965

2.334

2.586

2.82

3.107

1000

0.675

1.282

1.646

1.962

2.33

2.581

2.813

3.098