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TABLE A.7 Critical values of t (from the 3rd edition textbook)
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Confidence Interval question and I have already attached Z table and T table. Please use these tables if need to . Thanks

1. The R# Medical Centre undertook a survey to determine the average waiting time of patients in the surgery before they saw a doctor. From 18 responses, the average and standard deviation of the waiting times was found to be 10.3 and 2.71 minutes, respectively. Assuming the information was collected through a random sample and that the waiting time is approximately normally distributed, calculate a 95% confidence interval for the mean waiting time at the medical centre. State the upper bound correct to 3 decimal places.

TABLE A.7 Critical values of t

(from the 3rd edition textbook) Upper tail area (shaded)

0 tcrit t Upper tail areas df t.10 t.05 t.025 t.01 t.005 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

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50 3.078

1.886

1.638

1.533

1.476

1.440

1.415

1.397

1.383

1.372

1.363

1.356

1.350

1.345

1.341

1.337

1.333

1.330

1.328

1.325

1.323

1.321

1.319

1.318

1.316

1.315

1.314

1.313

1.311

1.310

1.309

1.309

1.308

1.307

1.306

1.306

1.305

1.304

1.304

1.303

1.303

1.302

1.302

1.301

1.301

1.300

1.300

1.299

1.299

1.299 6.314

2.920

2.353

2.132

2.015

1.943

1.895

1.860

1.833

1.812

1.796

1.782

1.771

1.761

1.753

1.746

1.740

1.734

1.729

1.725

1.721

1.717

1.714

1.711

1.708

1.706

1.703

1.701

1.699

1.697

1.696

1.694

1.692

1.691

1.690

1.688

1.687

1.686

1.685

1.684

1.683

1.682

1.681

1.680

1.679

1.679

1.678

1.677

1.677

1.676 12.706

4.303

3.182

2.776

2.571

2.447

2.365

2.306

2.262

2.228

2.201

2.179

2.160

2.145

2.131

2.120

2.110

2.101

2.093

2.086

2.080

2.074

2.069

2.064

2.060

2.056

2.052

2.048

2.045

2.042

2.040

2.037

2.035

2.032

2.030

2.028

2.026

2.024

2.023

2.021

2.020

2.018

2.017

2.015

2.014

2.013

2.012

2.011

2.010

2.009 31.821

6.965

4.541

3.747

3.365

3.143

2.998

2.896

2.821

2.764

2.718

2.681

2.650

2.624

2.602

2.583

2.567

2.552

2.539

2.528

2.518

2.508

2.500

2.492

2.485

2.479

2.473

2.467

2.462

2.457

2.453

2.449

2.445

2.441

2.438

2.434

2.431

2.429

2.426

2.423

2.421

2.418

2.416

2.414

2.412

2.410

2.408

2.407

2.405

2.403 63.657

9.925

5.841

4.604

4.032

3.707

3.499

3.355

3.250

3.169

3.106

3.055

3.012

2.977

2.947

2.921

2.898

2.878

2.861

2.845

2.831

2.819

2.807

2.797

2.787

2.779

2.771

2.763

2.756

2.750

2.744

2.738

2.733

2.728

2.724

2.719

2.715

2.712

2.708

2.704

2.701

2.698

2.695

2.692

2.690

2.687

2.685

2.682

2.680

2.678 770? Appendix t.001

318.309

22.327

10.215

7.173

5.893

5.208

4.785

4.501

4.297

4.144

4.025

3.930

3.852

3.787

3.733

3.686

3.646

3.610

3.579

3.552

3.527

3.505

3.485

3.467

3.450

3.435

3.421

3.408

3.396

3.385

3.375

3.365

3.356

3.348

3.340

3.333

3.326

3.319

3.313

3.307

3.301

3.296

3.291

3.286

3.281

3.277

3.273

3.269

3.265

0 tcrit t Upper tail areas df t.10 t.05 t.025 t.01 t.005 t.001 51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

150

200 1.298

1.298

1.298

1.297

1.297

1.297

1.297

1.296

1.296

1.296

1.296

1.295

1.295

1.295

1.295

1.295

1.294

1.294

1.294

1.294

1.294

1.293

1.293

1.293

1.293

1.293

1.293

1.292

1.292

1.292

1.292

1.292

1.292

1.292

1.292

1.291

1.291

1.291

1.291

1.291

1.291

1.291

1.291

1.291

1.291

1.290

1.290

1.290

1.290

1.290

1.287

1.286

1.282 1.675

1.675

1.674

1.674

1.673

1.673

1.672

1.672

1.671

1.671

1.670

1.670

1.669

1.669

1.669

1.668

1.668

1.668

1.667

1.667

1.667

1.666

1.666

1.666

1.665

1.665

1.665

1.665

1.664

1.664

1.664

1.664

1.663

1.663

1.663

1.663

1.663

1.662

1.662

1.662

1.662

1.662

1.661

1.661

1.661

1.661

1.661

1.661

1.660

1.660

1.655

1.653

1.645 2.008

2.007

2.006

2.005

2.004

2.003

2.002

2.002

2.001

2.000

2.000

1.999

1.998

1.998

1.997

1.997

1.996

1.995

1.995

1.994

1.994

1.993

1.993

1.993

1.992

1.992

1.991

1.991

1.990

1.990

1.990

1.989

1.989

1.989

1.988

1.988

1.988

1.987

1.987

1.987

1.986

1.986

1.986

1.986

1.985

1.985

1.985

1.984

1.984

1.984

1.976

1.972

1.960 2.402

2.400

2.399

2.397

2.396

2.395

2.394

2.392

2.391

2.390

2.389

2.388

2.387

2.386

2.385

2.384

2.383

2.382

2.382

2.381

2.380

2.379

2.379

2.378

2.377

2.376

2.376

2.375

2.374

2.374

2.373

2.373

2.372

2.372

2.371

2.370

2.370

2.369

2.369

2.368

2.368

2.368

2.367

2.367

2.366

2.366

2.365

2.365

2.365

2.364

2.351

2.345

2.326 2.676

2.674

2.672

2.670

2.668

2.667

2.665

2.663

2.662

2.660

2.659

2.657

2.656

2.655

2.654

2.652

2.651

2.650

2.649

2.648

2.647

2.646

2.645

2.644

2.643

2.642

2.641

2.640

2.640

2.639

2.638

2.637

2.636

2.636

2.635

2.634

2.634

2.633

2.632

2.632

2.631

2.630

2.630

2.629

2.629

2.628

2.627

2.627

2.626

2.626

2.609

2.601

2.576 3.258

3.255

3.251

3.248

3.245

3.242

3.239

3.237

3.234

3.232

3.229

3.227

3.225

3.223

3.220

3.218

3.216

3.214

3.213

3.211

3.209

3.207

3.206

3.204

3.202

3.201

3.199

3.198

3.197

3.195

3.194

3.193

3.191

3.190

3.189

3.188

3.187

3.185

3.184

3.183

3.182

3.181

3.180

3.179

3.178

3.177

3.176

3.175

3.175

3.174

3.145

3.131

3.090 ? Appendix? 771

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This question was answered on: Feb 21, 2020

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