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Quiz von Brage Haavik, aktualisiert more than 1 year ago
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Erstellt von Brage Haavik
vor etwa 5 Jahre
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Frage 1
Frage
Assuming the data meets the assumptions of parametric tests, non-parametric tests compared to their parametric counterparts ____________.
Antworten
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Are more conservative
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Have less statistical power
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Are less likely to accept the alternative hypothesis
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All of the above
Frage 2
Frage
A researcher measured leadership skills in doctors, police officers and accountants. The data were skewed. What is the most appropriate test to analyse the data?
Antworten
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Kruskal-wallis test
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Friedman test
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Wilcoxon test
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Mann-whitney test
Frage 3
Frage
The results of the test used to analyze the data described in question 2 showed a significant result. How should the researcher carry out post-hoc tests?
Antworten
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Compare groups using Mann-whitney test
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Compare groups using Wilcoxon test
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Compare groups using t-Test
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Non of the above. Post-hoc analyses can not be carried out with non-parametric data
Frage 4
Frage
An advantage of non parametric statistics is that ____________.
Antworten
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They are easy to calculate
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They are very powerful
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You need a computer to calculate them
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They have many assumptions to meet
Frage 5
Frage
Which of the following tests is analogous to a standard within-subjects ANOVA?
Antworten
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Friedman
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Kruskal-wallis
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Wilcoxon
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Mann-whitney
Frage 6
Frage
Tied scores (when two or more scores have the same value) may present a problem in non-parametric tests. The way to deal with them in a Kruskal-Wallis test is to
Antworten
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Throw out the tied data
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Assign any tied values the lower of the ranks they would have recieved had they not been tied
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Use a random number table to assign ranks to the tied values
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Assign any tied values the average of the ranks they would have recieved had they not been tied
Frage 7
Frage
A data-set contains the following values: 23, 28, 37, 23, 45, 49, 37, 62. Rank the values. Which rank is associated with value 37?
Antworten
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4
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4.5
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3.5
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6
Frage 8
Frage
Researchers wanted to examine whether the 'sea-food' diet was effective. A group of volunteers were placed on the diet and their weight (in kilograms) was measured at the beginning of the diet, after 1 month, after 2 months, then at the end of the diet after 3 months. The data were not normally distributed. Which test would be appropriate to analyse the data?
Antworten
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Friedman
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Wilcoxon
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Kruskal-Wallis
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Mann-Whitney
Frage 9
Frage
The output from the study described in question 8 is shown below.
What is the correct way to report these results?
Antworten
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The weight of the participants did not significantly change during the diet, x2 (3) = .60, p = .89
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The weight of the participants did significantly changed during the diet, x2 (3) = .60, p > .05
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The weight of the participants did not significantly change during the diet, x2 (3) = .60, p = .90
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The weight of the participants did significantly changed during the diet, x2 (3) = .60, p < .05
Frage 10
Frage
In a Kruskal-Wallis test, the ____________ the value of H, the more likely you are to reject the null hypothesis
Antworten
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More negative
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Smaller
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Larger
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H is not relevant for the Kruskal-Wallis test
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