Question 21 (1 point) Use this data for questions 21 - 26 Subject Post-Test Scor
ID: 3202371 • Letter: Q
Question
Question 21 (1 point)
Use this data for questions 21 - 26
Subject Post-Test Score Pre-Test Score
1 18 12
2 43 40
3 25 20
4 36 33
5 47 44
6 46 40
7 46 40
Which statistical test would tell if the post-test scores had
significantly improved over the pre-test scores?
Question 21 options:
Z-test
t-test
t-test of co-related scores
(t-test of the differences)
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Alpha is set at .05 for this one-tailed test. What are the degrees of freedom?
Question 22 options:
4
5
6
7
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Question 23 (1 point)
If N= 7
What is the tabled Level of Significance for this test? Set p = .05 and use a One-Tailed Test
Question 23 options:
1.943
2.015
2.447
2.571
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Question 24 (1 point)
What is the mean increase or difference in scores? (Hint: mean of D)
Question 24 options:
32
4.571
1.512
28.5
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Question 25 (1 point)
What is the standard deviation of the difference in scores?
Question 25 options:
7.33
1.511
5.34
9.14
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Question 26 (1 point)
Is this difference statistically significant?
Question 26 options:
Yes
No
Can't be determined form the data given
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Question 27 (1 point)
Use this data for questions 27 - 32)
Subject Post-Test Score Pre-Test Score Differences?
1 18 15
2 44 42
3 25 22
4 36 34
5 47 47
6 46 45
7 44 40
8 43 33
9 34 28
10 33 28
Which statistical test would tell if the post test scores had significantly improved over the pre-test scores?
Question 27 options:
z-test
t-test
t-test of related scores
(t-test of the differences)
Chi-square
(pronounced KI as in Kite)
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Question 28 (1 point)
Alpha is set at .05 for this one-tailed test, and N=10. What are the degrees of freedom?
Question 28 options:
6
7
10
9
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Question 29 (1 point)
If d.f. are equal to 9, what is the tabled value for this correlated t-test?
Question 29 options:
2.365
2.306
1.833
1.895
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Question 30 (1 point)
What is the mean increase or difference in scores? (Hint: mean of D)
Question 30 options:
3.6
1.8
2.875
36
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Question 31 (1 point)
What is the standard deviation of the difference in scores?
Question 31 options:
4.69
2.875
2.722
10
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Question 32 (1 point)
Is this difference statistically significant?
Question 32 options:
Yes
No
Can't be determined form the information given
Save
Z-test
t-test
t-test of co-related scores
(t-test of the differences)
Explanation / Answer
21) as this is before and after study we should use
t-test of co-related scores
(t-test of the differences)
22)degree of freedom =n-1 =6
23)from table at 0.05 level. and 6 df , table value =1.943
24)
hence mean score =4.571
25) std deviation =1.511
26) here t stat =dmean/std error =4.571/0.571 =8
as tstat is higher then 1.943 level, we test is statistically significant. hence Yes
27)t-test of related scores
(t-test of the differences)
28)degree of freedom =n-1 =10-1 =9
29)for one tailed test ,a t 0.05 level and 9 df , table score =1.833
30)
30) mean score increase/decrease =3.6
31) std deviation =2.875
32) tstat =3.6/0.909 =3.959
as tstat is greater then 1.833 , hence it is statistically significant, Yes
subject post trade pre test Score 1 18 12 6 2 43 40 3 3 25 20 5 4 36 33 3 5 47 44 3 6 46 40 6 7 46 40 6 mean 4.571 std deviaition 1.512 std error= std dev/(n)^(1/2) 0.571Related Questions
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