Assuming the data meets the assumptions of parametric tests, non-parametric tests compared to their parametric counterparts ____________.
Are more conservative
Have less statistical power
Are less likely to accept the alternative hypothesis
All of the above
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?
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?
Compare groups using Mann-whitney test
Compare groups using Wilcoxon test
Compare groups using t-Test
Non of the above. Post-hoc analyses can not be carried out with non-parametric data
An advantage of non parametric statistics is that ____________.
They are easy to calculate
They are very powerful
You need a computer to calculate them
They have many assumptions to meet
Which of the following tests is analogous to a standard within-subjects ANOVA?
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
Throw out the tied data
Assign any tied values the lower of the ranks they would have recieved had they not been tied
Use a random number table to assign ranks to the tied values
Assign any tied values the average of the ranks they would have recieved had they not been tied
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?
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?
The output from the study described in question 8 is shown below.
What is the correct way to report these results?