2.3 Data analysis
The mean of freshwater snails from each sampling site was calculated to
give months as well as total values. Percentages were used to express
frequency of distribution of freshwater snails in respect of species and
sampling sites. One-way Analysis of Variance (ANOVA) was calculated to
show significant difference between distribution and abundance of the
freshwater snails across sampling sites. Similarly, ANOVA was used to
show the significant difference between physico-chemical factors and the
sampling sites. Pearson’s Correlation Coefficient was determined to show
the direction (positive or negative) and magnitude (weak, moderate or
strong) of the relationship between snail population and physicochemical
factors. The level of significance was determined at 5% (P ≤ 0.05) and
95% confidence limit.