1. You conduct a study on a sample of 28 children to investigate how test anxiety levels (none, low, medium, high) affect mid-term examination scores. The resulting data were not normally distributed. What test should be used to analyse the data?
   1. Kruskal Wallis Test
   2. Wilcoxon Rank Sum test
   3. Independent t-test.
   4. Analysis of Variance (ANOVA) Test.