I am trying to determine whether a paired T test or Wilcoxon ranked sum test is more appropriate to test for significance of improvement in the following:
Patients were surveyed for pain scores before treatment on 0-10 scale Patients were then given intervention Patients were then surveyed for pain score after treatment on 0-10 scale.
The data are effectively paired since datapoints exist for the same patient pre and post treatment.
Wilcoxon-signed-rank yields a very small P value over 24 patients. Very, very small (p<0.0001).
IS wilcoxon-SR appropriate for this application or should I be using a paired T test or chi-square test?