PLEASE SHOW WORK
Suppose that in a two-tailed hypothesis test you
calculated a Z statistic of -1.75. What is your p-value? And how
would you conclude if α = 5%?
P-value = 0.0401. H0 should be rejected at the 5% level
P-value = 0.0802. H0 should be rejected at the 5% level
P-value = 0.0802. H0 should not be rejected at the 5% level
P-value = 0.0402. H0 should be rejected at the 5% level
None of the above statements is correct
For this and the next 3 questions. A journal article by Kashima et al describes research with parents of mentally retarded children in which a media-based program presented, primarily through videotapes and instructional manuals, information on self-help skill teaching. As part of the study, 17 families participated in a training program led by experienced staff members of a parent training project. Before and after the training program, the Behavioral Vignettes Test was administrated to the primary parents in each family. The test assesses knowledge of behavior modification principles. A higher score indicates greater knowledge. The following are the pre- and post-training scores made by the primary parent on the test. Can we conclude, on the basis of these data, that the training program INCREASES KNOWLEDGE of behavior modification principles? To begin, what is the correct statement of hypothesis for this test? [Source: "Media-based Versus Professionally Led Training Parents of 'V'êÈÜ«Mentally retarded Children," American Journal on Mental Retardation, 93 (1988), 209-217]
Pre |
Post |
7 |
11 |
6 |
14 |
10 |
16 |
16 |
17 |
8 |
9 |
13 |
15 |
8 |
9 |
14 |
17 |
H0: σ2A ≥ σ2B; H1: σ2A < σ2B
H0: μA = μB; H1: μA ≠ μB
H0: μD ≥ 0; H1: μD < 0
H0: μD ≤ 0; H1: μD > 0
H0: μD = 0; H1: μD ≠ 0
None of the above
From your computer output, what is the correct p-value for this test?
6.1110 |
||
Less than 0.01 |
||
2.5835 |
||
2.9208 |
||
More than 0.05 |
||
None of the above |
From your computer output, what is the correct critical value for this test - at the 0.01 level of significance?
6.111 |
||
Less than 0.01 |
||
2.5835 |
||
2.9208 |
||
More than 0.05 |
||
None of the above |
What is your decision? How do you conclude
Do not reject H0 . There is no evidence of knowledge gain |
||
Reject H0. There is evidence of knowledge improvement at the 1% level of significance |
||
Reject H0. The calculated statistic is less than the critical value at the 1% level of significance |
||
Do not reject H0. The calculated statistic is greater than the critical value at the 1% level of significance |
||
None of the above |
Ans:
1)
p-value(2 tailed)=2*P(z<-1.75)=2*NORMSDIST(-1.75)=0.0802
P-value = 0.0802. H0 should not be rejected at the 5% level.
2)
Pre | Post | d | |
1 | 7 | 11 | 4 |
2 | 6 | 14 | 8 |
3 | 10 | 16 | 6 |
4 | 16 | 17 | 1 |
5 | 8 | 9 | 1 |
6 | 13 | 15 | 2 |
7 | 8 | 9 | 1 |
8 | 14 | 17 | 3 |
d-bar= | 3.25 | ||
sd= | 2.605 |
H0: μD ≤ 0; H1: μD > 0
test statistic:
t=(3.25-0)/(2.605/sqrt(8))
t=3.529
df=8-1=7
p-value=tdist(3.529,7,1)=0.0048
p-value is Less than 0.01
critical t value=2.998
Reject H_{0.} There is evidence of knowledge improvement at the 1% level of significance
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