statistics methods for analyze properties

Since T-Test requires data from normal distribution
And after check our data, it's not.
normality checker, online excel file:
http://udel.edu/~mcdonald/stathistogram.xls

So, we should use "Kruskal-Wallis test" instead, which does not require data from normal distribution.
Online Calculator for two groups:
http://faculty.vassar.edu/lowry/utest.html