The Mann-Whitney U test is used to compare differences between two independent groups when the variable of interest is on the _______ scale.Answ

The Mann-Whitney U test is used to compare differences between two independent groups when the variable of interest is on the ordinal scale. This non-parametric test is particularly useful when the assumptions of the t-test are not met, such as when the data does not follow a normal distribution. The Mann-Whitney U test ranks all the values from both groups together and then compares the sum of ranks between the two groups. If the groups are significantly different, this will be reflected in the ranks, and the U statistic derived from these ranks will indicate whether to reject the null hypothesis, suggesting that there is a significant difference between the groups.