SPSS Mann | Mann-Whitney U test SPSS
ByRubenGeertvandenBergunderNonparametricTests&StatisticsA-Z[1][2]TheMann-Whitneytestisanalternativefortheindependentsamplest-test[3]whentheassumptionsrequiredbythelatterarentmetbythedata.Themostcommonscenarioistestinganonnormallydistributedoutcomevariableinasmallsample(say,n<25).TheMann-WhitneytestisalsoknownastheWilcoxontestforindependentsamples-whichshouldntbeconfusedwiththeWilcoxonsigned-rankstest[4]forrelatedsamples.ResearchQuestionWelluseadratings.savduringthistutorial,ascreensho...
By Ruben Geert van den Berg under Nonparametric Tests & Statistics A-Z[1][2]The Mann-Whitney test is an alternative for the independent samples t-test[3] when the assumptions required by the latter arent met by the data. The most common scenario is testing a non normally distributed outcome variable in a small sample (say, n < 25).The Mann-Whitney test is also known as the Wilcoxon test for independent samples -which shouldnt be confused with the Wilcoxon signed-ranks test[4] for related samples.
Research QuestionWell use adratings.sav during this tutorial, a screenshot of which is shown above. These data contain the ratings of 3 car commercials by 18 respondents, balanced over gender and age category. Our research question is whether men and women judge our commercials similarly. For each commercial separately, our null hypothesis is: “the mean ratings of men and women are equal.” [5]
Quick Data Check - Split HistogramsBefore running any sign...