We have 20 students (N=20) who took pre-class test (70 questions) for the knowledge of a subject and did an exactly same test after taking the class. We would like to know if their knowledge has improved after taking the class so I am going to run Wilcoxon signed rank test for al...
From the plot above, it can be seen that theweightdata are approximately symmetrical (you should not expect them to be perfect, particularly when you have smaller numbers of samples in your study). Therefore, we can use the Wilcoxon signed-rank test to analyse our data. Note that, in the...