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Nominal or categorical (male/female, country of origin) (Difference (Chi…

- - - - one dependent variable
      - one independent variable (two categorical groups)
      - independence of observations
      - distribution for each group same or different?
- - - - Independent samples T-Test
        
        one dependent variable
        
        one independent variable
        
        independence of observations
        
        no significant outliers
        
        approximately normally distributed
        
        homogeneity of variances
      - Paired samples T-Test
        
        one dependent variable
        
        one independent variable
        
        no significant outliers
        
        approximately normally distributed
        
        Wilcoxon Signed-Rank Test (Nonparametric equivalent to paired T-Test
        
        one dependent variable (continuous or ordinal)
        
        one independent variable (consisting of 2 categorical, related, or matched groups)
        
        distribution of the difference b/w the groups is symmetrical