Mann-Whitney U-test 3
The Mann-Whitney U test
is a non-parametric statistical test used to compare two independent groups
when data can be ranked or ordered. It assesses the degree of separation (or
the amount of overlap) between the groups. This test is particularly useful
when the data doesn't meet the assumptions of parametric tests, such as
normality.
Hypotheses
Null Hypothesis: The two
sets of scores are samples from the same population, implying no systematic
difference between them.
Alternative Hypothesis: The
two sets of scores differ systematically. If directional, it specifies the
direction of the difference.