Past experience indicates that the time required for high school seniors to complete a standardized test is a normal random variable with a standard deviation of 7 minutes. Test the hypothesis that σ = 7 against the alternative that &<7 if a random sample of the test times of 24 high school seniors has a standard deviations=5.64. Use a 0.01 level of significance. Click here to view page 1 of the Chi-Square Critical Values Table. Click here to view page 2 of the Chi-Square Critical Values Table. Identify the null and alternative hypotheses. Select the correct choice below and fill in the answer boxes to complete your choice. (Type integers or decimals. Do not round.) O A. O C. 102. Identify the critical region. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to two decimal places as needed.) OA. < OB. H O D. Ho OB. X> OC. Find the test statistic. (Round to two decimal places as needed.) What is the appropriate decision for this test? A. The test statistic is significant at the 0.01 level. Based on the test statistic, reject H, and conclude that there is sufficient evidence that <7. B. The test statistic is not significant at the 0.01 level. Based on the test statistic, fail to reject Ho and conclude that there is not sufficient evidence that <7. OC. The test statistic is not significant at the 0.01 level. Based on the test statistic, reject Ho and conclude that there is not sufficient evidence that σ <7.
Past experience indicates that the time required for high school seniors to complete a standardized test is a normal random variable with a standard deviation of 7 minutes. Test the hypothesis that σ = 7 against the alternative that &<7 if a random sample of the test times of 24 high school seniors has a standard deviations=5.64. Use a 0.01 level of significance. Click here to view page 1 of the Chi-Square Critical Values Table. Click here to view page 2 of the Chi-Square Critical Values Table. Identify the null and alternative hypotheses. Select the correct choice below and fill in the answer boxes to complete your choice. (Type integers or decimals. Do not round.) O A. O C. 102. Identify the critical region. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to two decimal places as needed.) OA. < OB. H O D. Ho OB. X> OC. Find the test statistic. (Round to two decimal places as needed.) What is the appropriate decision for this test? A. The test statistic is significant at the 0.01 level. Based on the test statistic, reject H, and conclude that there is sufficient evidence that <7. B. The test statistic is not significant at the 0.01 level. Based on the test statistic, fail to reject Ho and conclude that there is not sufficient evidence that <7. OC. The test statistic is not significant at the 0.01 level. Based on the test statistic, reject Ho and conclude that there is not sufficient evidence that σ <7.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
Related questions
Question
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Please I need help with this question attached
Transcribed Image Text:Past experience indicates that the time required for high school seniors to complete a standardized test is a normal random variable with a standard deviation of 7 minutes. Test the hypothesis that σ = 7 against the alternative that σ<7 if a random sample of the test times of 24
high school seniors has a standard deviation s = 5.64. Use a 0.01 level of significance.
Click here to view page 1 of the Chi-Square Critical Values Table.
Click here to view page 2 of the Chi-Square Critical Values Table.
Identify the null and alternative hypotheses. Select the correct choice below and fill in the answer boxes to complete your choice.
(Type integers or decimals. Do not round.)
○ A.
10² =
Ho
H₁:<
OC. Ho
Identify the critical region. Select the correct choice below and fill in the answer box(es) to complete your choice.
(Round to two decimal places as needed.)
OA. X<
OB. X2
>
orx²
or x->
Find the test statistic.
○ B.
Ho 1:0² =
H₁:0²>
OD. Ho
H₁:0² =
(Round to two decimal places as needed.)
What is the appropriate decision for this test?
○ A. The test statistic is significant at the 0.01 level. Based on the test statistic, reject Ho and conclude that there is sufficient evidence that σ <7.
○ B. The test statistic is not significant at the 0.01 level. Based on the test statistic, fail to reject Ho and conclude that there is not sufficient evidence that σ <7.
○ C. The test statistic is not significant at the 0.01 level. Based on the test statistic, reject Ho and conclude that there is not sufficient evidence that σ <7.
○ D. The test statistic is significant at the 0.01 level. Based on the test statistic, fail to reject Ho and conclude that there is sufficient evidence that σ < 7.
![Critical Values of the Chi-Squared Distribution
> > >
Critical Values of the Chi-Squared Distribution
a
25
0.995
1
2
3 0.0717 0.115
0.185
4
0.207
0.297
0.429
0.99
0.98 0.975 0.95
0.04393 0.03157 0.03628 0.03982
0.00393
0.0100 0.0201 0.0404 0.0506 0.103
0.216 0.352
0.484 0.711
5
0.412
0.554
0.752
0.831
1.145
1.610
2.343
6
0.676
0.872
1.134
1.237
1.635
2.204
3.070
7 0.989
1.239
1.564
1.690
2.167
2.833
3.822
0.90 0.80 0.75
0.50
0.0158 0.0642 0.102 0.148 0.455
0.211 0.446 0.575 0.713 1.386
0.584 1.005 1.213 1.424 2.366
1.064 1.649 1.923
2.195 3.357
2.675 3.000 4.351
3.455 3.828 5.348
4.255 4.671 6,346
0.70
0.30
1
2
1.074
2.408
3
3.665
0.25 0.20 0.10 0.05 0.025 0.02 0.01 0.005 0.001
1.323 1.642 2.706 3.841 5.024 5.412 6.635 7.879 10.827
2.773 3.219 4.005 5.991 7.378 7.824 9.210 10.597 13.815
4.108 4.642 6.251 7.815 9.348 9.837 11.345 12.838 16.266
4
4.878 5.385 5.989 7.779 9.488 11.143 11.668 13.277
5 6.064 6.626 7.289 9.236 11.070 12.832 13.388
14.860 18.466
15.086
16.750 20.515
в
7
8
1.344
1.647
2.032
2.180
2.733
3.490 4.594
5.071 5.527 7.344
9
1.735
2.088
2.532
2.700
3.325
10
2.156
2.558
3.059
3.247
3.940
4.168 5.380
4.865 6.179
5.899 6.393 8.343
6.737 7.267 9.342
9
10
11 2.603
3.053
3.609
3.816
4.575
12 3.074
3.571
4.178
4.404
5.226
13 3.565
4.107
4.765
5.009
5.892
5.578 6.989
6.304 7.807
7.041 8.634
7.584 8.148 10.341
11
12.899 13.701
7.231 7.841 8.558 10.645 12.592 14.449 15.033 16.812 18.548 22.457
8.383 9.037 9.803 12.017 14.067 16.013 16.622 18.475 20.278 24.321
8 9.524 10.219 11.030 13.362
15.507 17.535 18.168 20.090 21.955 26.124
10.656 11.389 12.242 14.684 16.919 19.023 19.679 21.666 23.589 27.877
11.781 12.549 13.442 15.987 18.307 20.483 21.161 23.209 25.188 29.588
14.631 17.275 19.675 21.920 22.618 24.725 26.757 31.264
8.438 9.034 11.340
9.299 9.926 12.340
13
14 4.075
4.660
5.368
5.629
6.571
7.790 9.467
10.165 10.821 13.339
15 4.601
5.229
5.985
6.262
7.261
8.547 10.307
11.037 11.721 14.339
15
16
5.142
5.812
6.614
6.908
7.962
17
5.697
6.408
7.255
7.564
8.672
21
228 988
18
6.265
7.015
7.906
8.231
9.390
19 6.844
7.633
8.567
8.907
10.117
20 7.434
8.260
9.237
9.591
10.851
8,034
8.897
9.915
10.283
22
23
8.643
9.260
9.542 10.600
10.196
10.982
11.293 11.689
24 9.886
10.856
25
10.520
11.524
11.992 12.401
12.697 13.120
26 11.160
11.591
12.338
13.091
13.848
14.611
12.198 13.409 13.844 15.379
27 11.808 12.878 14.125 14.573 16.151
28 12.461 13.565 14.847 15.308 16.928
29 13.121 14.256 15.574 16.047 17.708
23.567 24.577 28.336
30 13.787 14.953 16.306 16.791 18.493
24.478 25.508 29.336
40 20.707 22.164 23.838 24.433
26.509 29.051 32.345 33.66 34.872 39.335
50 27.991 29.707 31.664 32.357 34.764 37.689 41.449 42.942 44.313 49.335
60 35.534 37.485 39.699 40.482 43.188 46.459 50.641 52.294 53.809 59.335
9.312 11.152 11.912 12.624 15.338
10.085 12.002 12.792 13.531 16.338
10.865 12.857
11.651 13.716
12.443 14.578
13.240 15.445
14.041 16.314
14.848 17.187
15.659 18.062
16.473 18.940
17.292 19.820
18.114 20.703
18.939 21.588
19.768 22.475
20.599 23.364
17
13.675 14.440 17.338
14.562 15.352 18.338
15.452 16.266 19.337
16.344 17.182 20.337
17.240 18.101 21.337
18.137 19.021 22.337
19.037 19.943 23.337
19.939 20.867 24.337
20.843 21.792 25.336
18 20.601
21.749 22.719 26.336
22.657 23.647 27.336
a
27
0.995
0.99
0.98
0.975
0.95
0.90
0.80
0.75 0.70 0.50
|| - -
UE
V] ‹
30
40
50
60
12 14.011 14.845 15.812 18.549 21.026 23.337 24.054 26.217 28.300 32.909
15.119 15.984 16.985 19.812 22.362 24.736 25.471 27.688 29.819 34.527
14 16.222 17.117 18.151 21.064 23.685 26.119 26.873 29.141 31.319 36.124
17.322 18.245 19.311 22.307 24.996 27.488 28.259 30.578 32.801 37.698
16 18.418 19.369 20.465 23.542 26.296 28.845 29.633 32.000 34.267 39.252
19.511 20.489 21.615 24.769 27.587 30.191 30.995 33.409 35.718 40.791
21.605 22.760 25.989 28.869 31.526 32.346 34.805 37.156 42.312
19 21.689 22.718 23.900 27.204 30.144 32.852 33.687 36.191 38.582 43.819
20 22.775 23.828 25.038 28.412 31.410 34.170 35.020 37.566 39.997 45.314
21 23.858 24.935 26.171 29.615 32.671 35.479 36.343 38.932 41.401 46.796
22 24.939 26.039 27.301 30.813 33.924 36.781 37.659 40.289 42.796 48.268
23 26.018 27.141 28.429 32.007 35.172 38,076 38.968 41.638 44.181 49.728
24 27.096 28.241 29.553 33.196 36.415 39.364 40.270 42.980 45.558 51.179
25 28.172 29.339 30.675 34.382 37.652 40.646 41.566 44.314 46.928 52.619
26 29.246 30.435 31.795 35.563 38.885 41.923 42.856 45.642 48.290 54.051
27 30.319 31.528 32.912 36.741 40.113 43.195 44.140 46.963 49.645 55.475
28 31.391 32.620 34.027 37.916 41.337 44.461 45.419 48.278 50.994 56.892
29 32.461 33.711 35.139 39.087 42.557 45.722 46.693 49.588 52.335 58.301
33.530 34.800 36.250 40.256 43.773 46.979 47.962 50.892 53.672 59.702
44.165 45.616 47.269 51.805 55.758 59.342 60.436 63.691 66.766 73.403
54.723 56.334 58.164 63.167 67.505 71.420 72.613 76.154 79.490 86.660
65.226 66.981 68.972 74.397 79.082 83.298 84.58 88.379 91.952 99.608
0.30
0.25
0.20
0.10
0.05 0.025 0.02
0.01
0.005 0.001](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4b0207e5-d824-47d5-9e50-d36dcca73cf0%2F508a465d-018c-471a-88b3-bfbef934d0dd%2Fqhrnxux_processed.png&w=3840&q=75)
Transcribed Image Text:Critical Values of the Chi-Squared Distribution
> > >
Critical Values of the Chi-Squared Distribution
a
25
0.995
1
2
3 0.0717 0.115
0.185
4
0.207
0.297
0.429
0.99
0.98 0.975 0.95
0.04393 0.03157 0.03628 0.03982
0.00393
0.0100 0.0201 0.0404 0.0506 0.103
0.216 0.352
0.484 0.711
5
0.412
0.554
0.752
0.831
1.145
1.610
2.343
6
0.676
0.872
1.134
1.237
1.635
2.204
3.070
7 0.989
1.239
1.564
1.690
2.167
2.833
3.822
0.90 0.80 0.75
0.50
0.0158 0.0642 0.102 0.148 0.455
0.211 0.446 0.575 0.713 1.386
0.584 1.005 1.213 1.424 2.366
1.064 1.649 1.923
2.195 3.357
2.675 3.000 4.351
3.455 3.828 5.348
4.255 4.671 6,346
0.70
0.30
1
2
1.074
2.408
3
3.665
0.25 0.20 0.10 0.05 0.025 0.02 0.01 0.005 0.001
1.323 1.642 2.706 3.841 5.024 5.412 6.635 7.879 10.827
2.773 3.219 4.005 5.991 7.378 7.824 9.210 10.597 13.815
4.108 4.642 6.251 7.815 9.348 9.837 11.345 12.838 16.266
4
4.878 5.385 5.989 7.779 9.488 11.143 11.668 13.277
5 6.064 6.626 7.289 9.236 11.070 12.832 13.388
14.860 18.466
15.086
16.750 20.515
в
7
8
1.344
1.647
2.032
2.180
2.733
3.490 4.594
5.071 5.527 7.344
9
1.735
2.088
2.532
2.700
3.325
10
2.156
2.558
3.059
3.247
3.940
4.168 5.380
4.865 6.179
5.899 6.393 8.343
6.737 7.267 9.342
9
10
11 2.603
3.053
3.609
3.816
4.575
12 3.074
3.571
4.178
4.404
5.226
13 3.565
4.107
4.765
5.009
5.892
5.578 6.989
6.304 7.807
7.041 8.634
7.584 8.148 10.341
11
12.899 13.701
7.231 7.841 8.558 10.645 12.592 14.449 15.033 16.812 18.548 22.457
8.383 9.037 9.803 12.017 14.067 16.013 16.622 18.475 20.278 24.321
8 9.524 10.219 11.030 13.362
15.507 17.535 18.168 20.090 21.955 26.124
10.656 11.389 12.242 14.684 16.919 19.023 19.679 21.666 23.589 27.877
11.781 12.549 13.442 15.987 18.307 20.483 21.161 23.209 25.188 29.588
14.631 17.275 19.675 21.920 22.618 24.725 26.757 31.264
8.438 9.034 11.340
9.299 9.926 12.340
13
14 4.075
4.660
5.368
5.629
6.571
7.790 9.467
10.165 10.821 13.339
15 4.601
5.229
5.985
6.262
7.261
8.547 10.307
11.037 11.721 14.339
15
16
5.142
5.812
6.614
6.908
7.962
17
5.697
6.408
7.255
7.564
8.672
21
228 988
18
6.265
7.015
7.906
8.231
9.390
19 6.844
7.633
8.567
8.907
10.117
20 7.434
8.260
9.237
9.591
10.851
8,034
8.897
9.915
10.283
22
23
8.643
9.260
9.542 10.600
10.196
10.982
11.293 11.689
24 9.886
10.856
25
10.520
11.524
11.992 12.401
12.697 13.120
26 11.160
11.591
12.338
13.091
13.848
14.611
12.198 13.409 13.844 15.379
27 11.808 12.878 14.125 14.573 16.151
28 12.461 13.565 14.847 15.308 16.928
29 13.121 14.256 15.574 16.047 17.708
23.567 24.577 28.336
30 13.787 14.953 16.306 16.791 18.493
24.478 25.508 29.336
40 20.707 22.164 23.838 24.433
26.509 29.051 32.345 33.66 34.872 39.335
50 27.991 29.707 31.664 32.357 34.764 37.689 41.449 42.942 44.313 49.335
60 35.534 37.485 39.699 40.482 43.188 46.459 50.641 52.294 53.809 59.335
9.312 11.152 11.912 12.624 15.338
10.085 12.002 12.792 13.531 16.338
10.865 12.857
11.651 13.716
12.443 14.578
13.240 15.445
14.041 16.314
14.848 17.187
15.659 18.062
16.473 18.940
17.292 19.820
18.114 20.703
18.939 21.588
19.768 22.475
20.599 23.364
17
13.675 14.440 17.338
14.562 15.352 18.338
15.452 16.266 19.337
16.344 17.182 20.337
17.240 18.101 21.337
18.137 19.021 22.337
19.037 19.943 23.337
19.939 20.867 24.337
20.843 21.792 25.336
18 20.601
21.749 22.719 26.336
22.657 23.647 27.336
a
27
0.995
0.99
0.98
0.975
0.95
0.90
0.80
0.75 0.70 0.50
|| - -
UE
V] ‹
30
40
50
60
12 14.011 14.845 15.812 18.549 21.026 23.337 24.054 26.217 28.300 32.909
15.119 15.984 16.985 19.812 22.362 24.736 25.471 27.688 29.819 34.527
14 16.222 17.117 18.151 21.064 23.685 26.119 26.873 29.141 31.319 36.124
17.322 18.245 19.311 22.307 24.996 27.488 28.259 30.578 32.801 37.698
16 18.418 19.369 20.465 23.542 26.296 28.845 29.633 32.000 34.267 39.252
19.511 20.489 21.615 24.769 27.587 30.191 30.995 33.409 35.718 40.791
21.605 22.760 25.989 28.869 31.526 32.346 34.805 37.156 42.312
19 21.689 22.718 23.900 27.204 30.144 32.852 33.687 36.191 38.582 43.819
20 22.775 23.828 25.038 28.412 31.410 34.170 35.020 37.566 39.997 45.314
21 23.858 24.935 26.171 29.615 32.671 35.479 36.343 38.932 41.401 46.796
22 24.939 26.039 27.301 30.813 33.924 36.781 37.659 40.289 42.796 48.268
23 26.018 27.141 28.429 32.007 35.172 38,076 38.968 41.638 44.181 49.728
24 27.096 28.241 29.553 33.196 36.415 39.364 40.270 42.980 45.558 51.179
25 28.172 29.339 30.675 34.382 37.652 40.646 41.566 44.314 46.928 52.619
26 29.246 30.435 31.795 35.563 38.885 41.923 42.856 45.642 48.290 54.051
27 30.319 31.528 32.912 36.741 40.113 43.195 44.140 46.963 49.645 55.475
28 31.391 32.620 34.027 37.916 41.337 44.461 45.419 48.278 50.994 56.892
29 32.461 33.711 35.139 39.087 42.557 45.722 46.693 49.588 52.335 58.301
33.530 34.800 36.250 40.256 43.773 46.979 47.962 50.892 53.672 59.702
44.165 45.616 47.269 51.805 55.758 59.342 60.436 63.691 66.766 73.403
54.723 56.334 58.164 63.167 67.505 71.420 72.613 76.154 79.490 86.660
65.226 66.981 68.972 74.397 79.082 83.298 84.58 88.379 91.952 99.608
0.30
0.25
0.20
0.10
0.05 0.025 0.02
0.01
0.005 0.001
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