Group Nonmajor, their professor did not teach in their major field of study. Student scores were ranked in each class, and the differences in ranks were compared. Krusal Wallis test applies as comparing students scores will be ranked and differentiated. 4. A researcher has the same participants rank two types of advertisements for the same product. Differences in ranks for each advertisement were compared. Friedman's test applies with the use for differences between groups with ordinal dependent variables 5. A professor measures student motivation before, during, and after a statistics course in a given semester. Student motivation was ranked at each time in the semester, and the differences in ranks were compared. Wilcoxon test applies as related samples are compared