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Calculating power for independent t-tests, Calculating A posteriori power,…

- - - - In 'statistical test' select 'Means: Difference between two independent means (two groups)'
        
        In 'Types of power analysis' select 'Post hoc: Compute achieved power = given (a) sample size and effect size
        
        Now imput whether it is one-tailed or two-tailed
        
        Now input the data that you have
        
        IF you don't have the effect size
        
        Click on ''Determine''
        
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        Click on calculate
        
        Look at Power (1- B err probs)
        
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