Hypothesis Tests that where distribution of underlying variables is free of parameters in termed as nonparametric tests. One such nonparametric tests is Kolmogorov Smirnov Test. Copy the link given below and paste it in new browser window to get more information on Kolmogorov Smirnov:- http://www.transtutors.com/homework-help/statistics/kolmogorov-smirnov.aspx