17750211
Description
Quiz by Brage Haavik, updated more than 1 year ago
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Created by Brage Haavik
about 5 years ago
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Question 1
Question
Assuming the data meets the assumptions of parametric tests, non-parametric tests compared to their parametric counterparts ____________.
Answer
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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
Question 2
Question
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?
Answer
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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
Question 3
Question
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?
Answer
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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
Question 4
Question
An advantage of non parametric statistics is that ____________.
Answer
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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
Question 5
Question
Which of the following tests is analogous to a standard within-subjects ANOVA?
Answer
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Friedman
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Kruskal-wallis
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Wilcoxon
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Mann-whitney
Question 6
Question
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
Answer
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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
Question 7
Question
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?
Answer
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4
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4.5
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3.5
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6
Question 8
Question
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?
Answer
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Friedman
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Wilcoxon
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Kruskal-Wallis
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Mann-Whitney
Question 9
Question
The output from the study described in question 8 is shown below.
What is the correct way to report these results?
Answer
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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
Question 10
Question
In a Kruskal-Wallis test, the ____________ the value of H, the more likely you are to reject the null hypothesis
Answer
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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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