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Stats concepts (Dispersion of data - the spread of observations and data…

- - - - Datas continuous distribution of at least ordinal scale
      - Observations within a group are independent
      - Samples are drawn randomly within a population
    - - Converts raw results into ranks then performs calculations on ranks to obtain test statistic
      - Test statistic is compared with known values for sampling distribution to accept or reject the null hypothesis
    - - Numerical data
        
        Wilcoxon signed rank, Mann Whitney, Spearman rank correlation
      - Categorical data
        
        Pearson Chi square test, odds ratio/relative risk, Fischers exact test