Mann-Whitney test


New Member
Hi there, I am a total beginner with SPSS and I really need your advice, because I am carrying out my research.
Is it possible to use Mann-Whitney test on a Likert scale when a question consists of 20 statements (a respondent has to choose how strongly he agrees or disagrees with every statement). Do I have to run a Mann-Whitney test on every single item of those 20 statements, or can I just make a new variable and count the average score of every respondent and then run a Mann-Whitney test on this new variable (on the average score) ? Thanks a million!