အရွယ်အစားဂဏန်းတွက်စက်၏အကျိုးသက်ရောက်မှု Calculate using 't values' and 'df' t value = df = Result: Cohen's d Effect Size (r) Calculate using Means and Standard Deviations Group 1 Group 2 M1= M2 = SD1= SD2= Result: Cohen's d Effect Size (r)