In this research, an inference statistic is used to analyze raw data, including Levin test that is used for variance
homogeneity, Kolmogorov Smirnov test is used for studying the normality and sample volume distribution, one-way
variance analyze (Anova) for determining the probability difference between three groups(Pyramid, Reverse
Pyramid and control);and incase of significance ,the post hoc LSD is used in the significance level of 0.05.