Before determining the type of test used,
especially in the case of comparative test,
it is required to ensure the normality of the distribution of variables.
If the variables are normal,
parametric tests are recommended otherwise equivalent non-parametric test will be considered. Kolmogorov-Smirnov test for determining the normality of distribution of variables is the best option is.
The results of the Kolmogorov-Smirnov test are given in table 2.