Research Methods Y2 - Mann Whitney/Wilcoxon Flashcards
What is the purpose of the Mann–Whitney test?
The Mann–Whitney test is used to look for a difference between two groups of scores. It is appropriate when the data is ordinal (scores are ranks) or interval but not normally distributed.
How do you determine significance in the Mann–Whitney test?
If the calculated U is equal to or less than the critical value, the null hypothesis is rejected, and the alternative hypothesis is accepted.
What is the purpose of the Wilcoxon test?
The Wilcoxon test is used to investigate differences in scores in repeated measures designs, comparing scores from the same participants before and after treatment.
How do you determine significance in the Wilcoxon test?
If the calculated T is less than or equal to the critical value, the null hypothesis is rejected, and the alternative hypothesis is accepted.
What is an ‘Inferential test’?
An inferential test is a statistical test used to determine whether two samples are significantly different.
What does ‘Ordinal data’ mean?
Ordinal data refers to data that is ranked or ordered but does not have equal intervals between points.
What does ‘Significant difference’ mean?
A significant difference indicates that the results are unlikely to be due to chance, typically at 𝑝≤0.05.
What is a ‘Two-tailed test’?
A two-tailed test is used when the alternative hypothesis predicts a difference but does not specify the direction of the difference.
