Critical values of t

df\p

 

 

 

 

 

 

 

 

One Tail

0.40

0.25

0.10

0.05

0.025

0.01

0.005

0.0005

Two Tail

0.80

0.50

0.20

0.10

0.05

0.02

0.01

0.001

1

0.324920

1.000000

3.077684

6.313752

12.70620

31.82052

63.65674

636.6192

2

0.288675

0.816497

1.885618

2.919986

4.30265

6.96456

9.92484

31.5991

3

0.276671

0.764892

1.637744

2.353363

3.18245

4.54070

5.84091

12.9240

4

0.270722

0.740697

1.533206

2.131847

2.77645

3.74695

4.60409

8.6103

5

0.267181

0.726687

1.475884

2.015048

2.57058

3.36493

4.03214

6.8688

 

6

0.264835

0.717558

1.439756

1.943180

2.44691

3.14267

3.70743

5.9588

7

0.263167

0.711142

1.414924

1.894579

2.36462

2.99795

3.49948

5.4079

8

0.261921

0.706387

1.396815

1.859548

2.30600

2.89646

3.35539

5.0413

9

0.260955

0.702722

1.383029

1.833113

2.26216

2.82144

3.24984

4.7809

10

0.260185

0.699812

1.372184

1.812461

2.22814

2.76377

3.16927

4.5869

 

11

0.259556

0.697445

1.363430

1.795885

2.20099

2.71808

3.10581

4.4370

12

0.259033

0.695483

1.356217

1.782288

2.17881

2.68100

3.05454

4.3178

13

0.258591

0.693829

1.350171

1.770933

2.16037

2.65031

3.01228

4.2208

14

0.258213

0.692417

1.345030

1.761310

2.14479

2.62449

2.97684

4.1405

15

0.257885

0.691197

1.340606

1.753050

2.13145

2.60248

2.94671

4.0728

 

16

0.257599

0.690132

1.336757

1.745884

2.11991

2.58349

2.92078

4.0150

17

0.257347

0.689195

1.333379

1.739607

2.10982

2.56693

2.89823

3.9651

18

0.257123

0.688364

1.330391

1.734064

2.10092

2.55238

2.87844

3.9216

19

0.256923

0.687621

1.327728

1.729133

2.09302

2.53948

2.86093

3.8834

20

0.256743

0.686954

1.325341

1.724718

2.08596

2.52798

2.84534

3.8495

 

21

0.256580

0.686352

1.323188

1.720743

2.07961

2.51765

2.83136

3.8193

22

0.256432

0.685805

1.321237

1.717144

2.07387

2.50832

2.81876

3.7921

23

0.256297

0.685306

1.319460

1.713872

2.06866

2.49987

2.80734

3.7676

24

0.256173

0.684850

1.317836

1.710882

2.06390

2.49216

2.79694

3.7454

25

0.256060

0.684430

1.316345

1.708141

2.05954

2.48511

2.78744

3.7251

 

26

0.255955

0.684043

1.314972

1.705618

2.05553

2.47863

2.77871

3.7066

27

0.255858

0.683685

1.313703

1.703288

2.05183

2.47266

2.77068

3.6896

28

0.255768

0.683353

1.312527

1.701131

2.04841

2.46714

2.76326

3.6739

29

0.255684

0.683044

1.311434

1.699127

2.04523

2.46202

2.75639

3.6594

30

0.255605

0.682756

1.310415

1.697261

2.04227

2.45726

2.75000

3.6460

 

inf

0.253347

0.674490

1.281552

1.644854

1.95996

2.32635

2.57583

3.2905