Salaries of 40 college graduates who took a statistics course in college have a​ mean x​, of $ 60,300. Assuming a standard​ deviation, o​, of ​$12,142​, construct a ​99% confidence interval for estimating the population mean. $____< u > $____

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
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100%

Salaries of 40 college graduates who took a statistics course in college have a​ mean x​, of $ 60,300. Assuming a standard​ deviation, o​, of ​$12,142​, construct a ​99% confidence interval for estimating the population mean.

$____< u > $____

л
Critical t value
(negative)
α/2
Left tail
л
Critical t value
(negative)
Right tail
л
Two tails
Critical t value
(positive)
a/2
Critical value
(positive)
Degrees of
Freedom
2
5
8
9
10
11
12
13
14
15
16
17
22888*** *8858838858894882888888888
18
19
20
21
23
24
25
26
27
30
31
33
36
37
40
50
60
70
80
90
100
200
300
400
500
1000
2000
Large
Degrees of
Freedom
0.005
0.01
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
2715
2.712
2.708
2.704
2.690
2.678
2.660
2.648
2.639
2.632
2.626
2.601
2.592
2.588
2.586
2.581
2.578
2.576
0.005
0.01
0.01
0.02
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
2.412
2.403
2.390
2.381
2.374
2.368
2.364
2.345
2.339
2.336
2.334
2.330
2,328
2.326
0.01
0.02
Area in One Tail
0.025
Area in Two Tails
0.05
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
2014
2.009
2.000
1.994
1.990
1.987
1.984
1.972
1.968
1.966
1.965
1.962
1.961
1.960
Area in One Tail
0.025
Area in Two Tails
0.05
0.05
0.10
6.314
2.920
2.353
2.132
2015
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
1.679
1.676
1.671
1.667
1.664
1.662
1.660
1.653
1.650
1.649
1.648
1,646
1.646
1.645
0.06
0.10
0.10
0.20
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
1.301
1.299
1.296
1.294
1.292
1.291
1.290
1.286
1.284
1.284
1.283
1.282
1.282
1.282
0.10
0.20
Degrees of
Freedom
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
45
50
60
70
80
90
100
200
300
400
500
1000
2000
Large
Degrees of
Freedom
Transcribed Image Text:л Critical t value (negative) α/2 Left tail л Critical t value (negative) Right tail л Two tails Critical t value (positive) a/2 Critical value (positive) Degrees of Freedom 2 5 8 9 10 11 12 13 14 15 16 17 22888*** *8858838858894882888888888 18 19 20 21 23 24 25 26 27 30 31 33 36 37 40 50 60 70 80 90 100 200 300 400 500 1000 2000 Large Degrees of Freedom 0.005 0.01 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 2715 2.712 2.708 2.704 2.690 2.678 2.660 2.648 2.639 2.632 2.626 2.601 2.592 2.588 2.586 2.581 2.578 2.576 0.005 0.01 0.01 0.02 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 2.412 2.403 2.390 2.381 2.374 2.368 2.364 2.345 2.339 2.336 2.334 2.330 2,328 2.326 0.01 0.02 Area in One Tail 0.025 Area in Two Tails 0.05 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 2014 2.009 2.000 1.994 1.990 1.987 1.984 1.972 1.968 1.966 1.965 1.962 1.961 1.960 Area in One Tail 0.025 Area in Two Tails 0.05 0.05 0.10 6.314 2.920 2.353 2.132 2015 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 1.679 1.676 1.671 1.667 1.664 1.662 1.660 1.653 1.650 1.649 1.648 1,646 1.646 1.645 0.06 0.10 0.10 0.20 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 1.301 1.299 1.296 1.294 1.292 1.291 1.290 1.286 1.284 1.284 1.283 1.282 1.282 1.282 0.10 0.20 Degrees of Freedom 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 45 50 60 70 80 90 100 200 300 400 500 1000 2000 Large Degrees of Freedom
-833333
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.0
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
2222222222=223
1.9
2.0
2.1
2.4
2.5
26
27
2.8
29
3.0
3.1
.00
5000
5300
5790
6179
1999
6915
7257
7580
7881
8150
2413
8643
3049
9032
9192
9332
9452
9654
9641
9713
9772
9021
9061
0013
9018
9938
.9953
9966
9974
9961
9987
9990
9993
9995
9997
9999
00
0
Score
Area
1.645 0.9500
2.575
0.9950
Cumulative Area from the LEFT
01
03
5040
5120
5617
5010
6293
5438
5832
0217
1699
6950
7291
7651
7910
8186
8438
3665
3060
9049
9207
9345
9463
9564
9649
9719
9778
9626
9664
9896
9920
9940
9956
9965
9975
9982
9987
1666
9993
9996
9997
"Use these common values that result from interpolation:
02
5080
5478
5871
6255
0628
0985
7324
7642
7939
8212
8461
0686
8888
9066
9222
9357
9474
9573
9656
9726
9783
9830
9868
9696
9922
9941
3.4
3.50 and up
2
01
NOTE: For values of zabove 3.49, use 0.9999 for the area.
9956
9967
9076
9982
9987
9991
9994
9995
9997
POSITIVE Z Scores
102
1990
7019
7357
7673
7967
8238
8485
8708
0907
2006
82:36
9370
9484
9582
.9664
.9732
9788
9834
9871
9001
1925
9943
9967
9968
9977
9983
9988
9991
9994
9996
.9997
03
04
5160
5657
5048
4331
6700
7054
7369
7704
7995
8264
8508
.8729
8925
9099
9251
9382
9495
9591
9071
9738
9793
9838
9875
9904
9927
9945
9959
9969
9977
9964
9968
.9982
9994
9996
.9997
04
.05
5190
5500
5067
6368
6736
7058
7422
7734
2023
8290
8631
3749
2044
9115
9266
1600
9606
9699
9678
9744
8798
9042
9878
9000
9929
99346
0966
9970
9978
1908
9069
9992
9994
9996
9997
.05
90
5230
5636
6026
6406
6772
7123
7454
7764
8051
8315
8554
8770
2062
9131
9279
9406
9515
9608
9686
9750
9803
9846
9881
9909
9931
9948
9961
9971
9979
9985
9989
9992
9994
9996
9997
90'
07
5279
5675
6064
6443
6808
7157
7486
7794
8078
8340
8577
8790
8900
9147
9292
9418
9525
9616
9693
9756
9608
9850
9634
9911
9932
9949 .
9962
9972
9979
9985
9989
9992
9666
9996
9997
07
06
5319
5714
6103
6480
6844
7190
7517
7823
8106
8365
8509
8810
8997
9162
9008
9429
9535
9625
.9509
9761
9812
9554
9887
9913
9934
9961
9963
9973
9900
9956
9990
9993
9995
9996
9997
90
60
5350
5753
6141
6617
6879
7224
7549
7852
8133
8389
8621
8830
0015
9177
9319
9441
9645
9633
9706
9767
0817
9857
9890
9916
9006
.9952
9964
.9974
9901
9966
.9990
9993
.9995
.9997
.9998
60
Common Critical Values
Confidence
Level
0.90
0.95
0.99
Critical
Value
1.645
1.96
2.575
2
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.0
1.0
1.1
1.2
1.3
1.4
1.5
1.6
17
1.8
1.9
NENNENNSE
2.0
21
22
2.3
2.4
2.5
26
27
28
29
3.0
3.1
3.2
3.3
3.4
3.50 and up
2
Transcribed Image Text:-833333 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.0 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 2222222222=223 1.9 2.0 2.1 2.4 2.5 26 27 2.8 29 3.0 3.1 .00 5000 5300 5790 6179 1999 6915 7257 7580 7881 8150 2413 8643 3049 9032 9192 9332 9452 9654 9641 9713 9772 9021 9061 0013 9018 9938 .9953 9966 9974 9961 9987 9990 9993 9995 9997 9999 00 0 Score Area 1.645 0.9500 2.575 0.9950 Cumulative Area from the LEFT 01 03 5040 5120 5617 5010 6293 5438 5832 0217 1699 6950 7291 7651 7910 8186 8438 3665 3060 9049 9207 9345 9463 9564 9649 9719 9778 9626 9664 9896 9920 9940 9956 9965 9975 9982 9987 1666 9993 9996 9997 "Use these common values that result from interpolation: 02 5080 5478 5871 6255 0628 0985 7324 7642 7939 8212 8461 0686 8888 9066 9222 9357 9474 9573 9656 9726 9783 9830 9868 9696 9922 9941 3.4 3.50 and up 2 01 NOTE: For values of zabove 3.49, use 0.9999 for the area. 9956 9967 9076 9982 9987 9991 9994 9995 9997 POSITIVE Z Scores 102 1990 7019 7357 7673 7967 8238 8485 8708 0907 2006 82:36 9370 9484 9582 .9664 .9732 9788 9834 9871 9001 1925 9943 9967 9968 9977 9983 9988 9991 9994 9996 .9997 03 04 5160 5657 5048 4331 6700 7054 7369 7704 7995 8264 8508 .8729 8925 9099 9251 9382 9495 9591 9071 9738 9793 9838 9875 9904 9927 9945 9959 9969 9977 9964 9968 .9982 9994 9996 .9997 04 .05 5190 5500 5067 6368 6736 7058 7422 7734 2023 8290 8631 3749 2044 9115 9266 1600 9606 9699 9678 9744 8798 9042 9878 9000 9929 99346 0966 9970 9978 1908 9069 9992 9994 9996 9997 .05 90 5230 5636 6026 6406 6772 7123 7454 7764 8051 8315 8554 8770 2062 9131 9279 9406 9515 9608 9686 9750 9803 9846 9881 9909 9931 9948 9961 9971 9979 9985 9989 9992 9994 9996 9997 90' 07 5279 5675 6064 6443 6808 7157 7486 7794 8078 8340 8577 8790 8900 9147 9292 9418 9525 9616 9693 9756 9608 9850 9634 9911 9932 9949 . 9962 9972 9979 9985 9989 9992 9666 9996 9997 07 06 5319 5714 6103 6480 6844 7190 7517 7823 8106 8365 8509 8810 8997 9162 9008 9429 9535 9625 .9509 9761 9812 9554 9887 9913 9934 9961 9963 9973 9900 9956 9990 9993 9995 9996 9997 90 60 5350 5753 6141 6617 6879 7224 7549 7852 8133 8389 8621 8830 0015 9177 9319 9441 9645 9633 9706 9767 0817 9857 9890 9916 9006 .9952 9964 .9974 9901 9966 .9990 9993 .9995 .9997 .9998 60 Common Critical Values Confidence Level 0.90 0.95 0.99 Critical Value 1.645 1.96 2.575 2 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.0 1.0 1.1 1.2 1.3 1.4 1.5 1.6 17 1.8 1.9 NENNENNSE 2.0 21 22 2.3 2.4 2.5 26 27 28 29 3.0 3.1 3.2 3.3 3.4 3.50 and up 2
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