A Decision Tree Guide on what Statistical Tool to Use

Statistical Decision Tree based on type of data

Determine the data types
Data types range from Nominals, Ordinal or Interval/Scale

If its Ordinal or if the variable has an order, you may opt to test the relationships between them or the differences among rankings. If its Independent of each other you can use Mann Whitney to test two groups or Kruskal Wallis ANOVA for three or more groups. If the groups are Dependent of each other, use Wilcoxon for two groups and use Friedman's two way ANOVA for three or more groups.