Efficacy of Transcranial Direct Current Stimulation on calculative ability in individual with left hand dominance

Alternate hypothesis: Calculative ability will significantly improve with tDCS in individuals with right hemisphere dominance.
Null hypothesis: Calculative ability will not significantly improve with tDCS in individuals with right hemisphere dominance.
Data shows there was significance improvement in interventional group in comparison to control group
In Data analysis first, I have find the normality as my data was not normal so i used non-parametric test for within group and between group analysis.