Suppose the 90% confidence interval for the mean SAT scores of applicants at a business college is given by [1,691, 1,838]. This confidence interval uses the sample mean and the sample standard deviation based on 25 observations. Use t value 1.711 in your calculations. [You may find it useful to reference the t table.] What are the sample mean and the sample standard deviation used when computing the interval? (Round final answers to 2 decimal places.)   sample mean = sample standard deviation=

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Suppose the 90% confidence interval for the mean SAT scores of applicants at a business college is given by [1,691, 1,838]. This confidence interval uses the sample mean and the sample standard deviation based on 25 observations. Use t value 1.711 in your calculations. [You may find it useful to reference the t table.] What are the sample mean and the sample standard deviation used when computing the interval? (Round final answers to 2 decimal places.)

 

sample mean =
sample standard deviation=
TABLE 2 Student's t Distribution
Entries in this table provide the values of taaf that correspond to a given
upper-tail area a and a specified number of degrees of freedom df. For
example, for a = 0.05 and df = 10, P(Tp2 1.812) = 0.05.
Area In Upper
Tall, a
tar
df
0.20
0.10
0.05
0.025
0.01
0.005
6.314
2.920
1
1.376
3.078
12.706
31.821
63.657
2
1.061
1.886
4.303
6.965
9.925
3.182
4.541
5.841
4.604
3
0.978
1.638
2.353
4
0.941
1.533
2.132
2.776
3.747
0.920
1.476
2.015
2.571
3.365
4.032
1.440
1.415
1.397
6
0.906
1.943
2.447
3.143
3.707
7
0.896
1.895
2.365
2.998
3.499
8
0.889
1.860
2.306
2.896
3.355
9
0.883
1.383
1.833
2.262
2.821
3.250
10
0.879
1.372
1.812
2.228
2.764
3.169
11
0.876
1.363
1.796
2.201
2.718
3.106
12
0.873
1.356
1.782
2.179
2.681
3.055
13
0.870
1.350
1.771
2.160
2.650
3.012
14
0.868
1.345
1.761
2.145
2.624
2.977
15
0.866
1.341
1.753
2.131
2.602
2.947
16
0.865
1.337
1.746
2.120
2.583
2.921
17
0.863
1.333
1.740
2.110
2.567
2.898
18
0.862
1.330
1.734
2.101
2.552
2.878
19
0.861
1.328
1.729
2.093
2.539
2.861
20
0.860
1.325
1.725
2.086
2.528
2.845
21
0.859
1.323
1.721
2.080
2.518
2.831
2.074
2.069
2.064
22
0.858
1.321
1.717
2.508
2.819
23
0.858
1.319
1.714
2.500
2.807
24
0.857
1.318
1.711
2.492
2.797
25
0.856
1.316
1.708
2.060
2.485
2.787
26
0.856
1.315
1.706
2.056
2.479
2.779
2.473
2.467
27
0.855
1.314
1.703
2.052
2.771
28
0.855
1.313
1.701
2.048
2.763
29
0.854
1.311
1.699
2.045
2.462
2.756
30
0.854
1.310
1.697
2.042
2.457
2.750
31
0.853
1.309
1.696
2.040
2.453
2.744
32
0.853
1.309
1.694
2.037
2.449
2.738
2.733
2.728
33
0.853
1.308
1.692
2.035
2.445
34
0.852
1.307
1.691
2.032
2.441
35
0.852
1.306
1.690
2.030
2.438
2.724
1.306
1.305
36
0.852
1.688
2.028
2.434
2.719
37
0.851
1.687
2.026
2.431
2.715
38
0.851
1.304
1.686
2.024
2.429
2.712
39
0.851
1.304
1.685
2.023
2.426
2.708
40
0.851
1.303
1.684
2.021
2.423
2.704
41
0.850
1.303
1.683
2.020
2.421
2.701
42
0.850
1.302
1.682
2.018
2.418
2.698
1.302
1.301
0.850
1.681
1.680
43
2.017
2.416
2.695
44
0.850
2.015
2.414
2.692
1.679
1.679
1.678
45
0.850
1.301
2.014
2.412
2.690
1.300
1.300
2.687
2.685
46
0.850
2.013
2.410
47
0.849
2.012
2.408
0,849
2.407
2.405
48
1.299
1.677
2.011
2.682
49
0.849
1.299
1.677
2.010
2.680
50
0.849
1.299
1.676
2.009
2.403
2.678
1.298
1.298
51
0.849
1.675
2.008
2.402
2.676
52
0.849
1.675
2.007
2.400
2.674
53
0.848
1.298
1.674
2.006
2.399
2.672
54
0.848
1.297
1.674
2.005
2.397
2.670
55
0.848
1.297
1.673
2.004
2.396
2.668
1.297
1.297
56
0.848
1.673
2.003
2.395
2.667
57
0.848
1.672
2.002
2.394
2.665
58
0.848
1.296
1.672
2.002
2.392
2.663
59
0.848
1.296
1.671
2.001
2.391
2.662
60
0.848
1.296
1.671
2.000
2.390
2.660
80
0.846
1.292
1.664
1.990
2.374
2.639
100
0.845
1.290
1.660
1.984
2.364
2.626
150
0.844
1.287
1.655
1.976
2.351
2.609
200
0.843
1.286
1.653
1.972
2.345
2.601
500
0.842
1.283
1.648
1.965
2.334
2.586
1.282
1.282
1000
0.842
1.646
1.962
2.330
2.581
00
0.842
1.645
1.960
2.326
2.576
Source: t values calculated with Excel.
Transcribed Image Text:TABLE 2 Student's t Distribution Entries in this table provide the values of taaf that correspond to a given upper-tail area a and a specified number of degrees of freedom df. For example, for a = 0.05 and df = 10, P(Tp2 1.812) = 0.05. Area In Upper Tall, a tar df 0.20 0.10 0.05 0.025 0.01 0.005 6.314 2.920 1 1.376 3.078 12.706 31.821 63.657 2 1.061 1.886 4.303 6.965 9.925 3.182 4.541 5.841 4.604 3 0.978 1.638 2.353 4 0.941 1.533 2.132 2.776 3.747 0.920 1.476 2.015 2.571 3.365 4.032 1.440 1.415 1.397 6 0.906 1.943 2.447 3.143 3.707 7 0.896 1.895 2.365 2.998 3.499 8 0.889 1.860 2.306 2.896 3.355 9 0.883 1.383 1.833 2.262 2.821 3.250 10 0.879 1.372 1.812 2.228 2.764 3.169 11 0.876 1.363 1.796 2.201 2.718 3.106 12 0.873 1.356 1.782 2.179 2.681 3.055 13 0.870 1.350 1.771 2.160 2.650 3.012 14 0.868 1.345 1.761 2.145 2.624 2.977 15 0.866 1.341 1.753 2.131 2.602 2.947 16 0.865 1.337 1.746 2.120 2.583 2.921 17 0.863 1.333 1.740 2.110 2.567 2.898 18 0.862 1.330 1.734 2.101 2.552 2.878 19 0.861 1.328 1.729 2.093 2.539 2.861 20 0.860 1.325 1.725 2.086 2.528 2.845 21 0.859 1.323 1.721 2.080 2.518 2.831 2.074 2.069 2.064 22 0.858 1.321 1.717 2.508 2.819 23 0.858 1.319 1.714 2.500 2.807 24 0.857 1.318 1.711 2.492 2.797 25 0.856 1.316 1.708 2.060 2.485 2.787 26 0.856 1.315 1.706 2.056 2.479 2.779 2.473 2.467 27 0.855 1.314 1.703 2.052 2.771 28 0.855 1.313 1.701 2.048 2.763 29 0.854 1.311 1.699 2.045 2.462 2.756 30 0.854 1.310 1.697 2.042 2.457 2.750 31 0.853 1.309 1.696 2.040 2.453 2.744 32 0.853 1.309 1.694 2.037 2.449 2.738 2.733 2.728 33 0.853 1.308 1.692 2.035 2.445 34 0.852 1.307 1.691 2.032 2.441 35 0.852 1.306 1.690 2.030 2.438 2.724 1.306 1.305 36 0.852 1.688 2.028 2.434 2.719 37 0.851 1.687 2.026 2.431 2.715 38 0.851 1.304 1.686 2.024 2.429 2.712 39 0.851 1.304 1.685 2.023 2.426 2.708 40 0.851 1.303 1.684 2.021 2.423 2.704 41 0.850 1.303 1.683 2.020 2.421 2.701 42 0.850 1.302 1.682 2.018 2.418 2.698 1.302 1.301 0.850 1.681 1.680 43 2.017 2.416 2.695 44 0.850 2.015 2.414 2.692 1.679 1.679 1.678 45 0.850 1.301 2.014 2.412 2.690 1.300 1.300 2.687 2.685 46 0.850 2.013 2.410 47 0.849 2.012 2.408 0,849 2.407 2.405 48 1.299 1.677 2.011 2.682 49 0.849 1.299 1.677 2.010 2.680 50 0.849 1.299 1.676 2.009 2.403 2.678 1.298 1.298 51 0.849 1.675 2.008 2.402 2.676 52 0.849 1.675 2.007 2.400 2.674 53 0.848 1.298 1.674 2.006 2.399 2.672 54 0.848 1.297 1.674 2.005 2.397 2.670 55 0.848 1.297 1.673 2.004 2.396 2.668 1.297 1.297 56 0.848 1.673 2.003 2.395 2.667 57 0.848 1.672 2.002 2.394 2.665 58 0.848 1.296 1.672 2.002 2.392 2.663 59 0.848 1.296 1.671 2.001 2.391 2.662 60 0.848 1.296 1.671 2.000 2.390 2.660 80 0.846 1.292 1.664 1.990 2.374 2.639 100 0.845 1.290 1.660 1.984 2.364 2.626 150 0.844 1.287 1.655 1.976 2.351 2.609 200 0.843 1.286 1.653 1.972 2.345 2.601 500 0.842 1.283 1.648 1.965 2.334 2.586 1.282 1.282 1000 0.842 1.646 1.962 2.330 2.581 00 0.842 1.645 1.960 2.326 2.576 Source: t values calculated with Excel.
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