Ordinal Data: Nonparametric Statistical Analyses And Spss Applications Pdf Download [patched] ✪ <PREMIUM>

A Mann-Whitney U test indicated that pain scores were significantly lower in the treatment group (mean rank = 12.4) than in the placebo group (mean rank = 24.7), U = 68.5, z = -2.84, p = .005, r = -0.38.