These are the statistical analyses of a Two Way ANOVA in which each factor has 2 groups and total n=48:
 a nonsignificant main effect of duration of suffering F < 1 ,
 a significant main effect of lie detector, F(1, 44) = 6.62, p =.014, ŋp 2 = .13, and
 a significant interaction effect between duration of suffering and lie detector, F(1, 44) = 5.86, p = .020, ŋp 2 = .12.
Now I tried to calculate the minimal required sample size for a replication study with a power of .90.
I used the software Power*G to calculate the required sample size, but I am not sure if I am doing it right. Can somebody correct me please (see attachment)?
I am mostly struggling with which effect size I should use, is it .12 from the interaction effect above?
What is the amount of groups; because it is a Two Way ANOVA, is it 4 groups (2x2)?
Thanks a lot!
 a nonsignificant main effect of duration of suffering F < 1 ,
 a significant main effect of lie detector, F(1, 44) = 6.62, p =.014, ŋp 2 = .13, and
 a significant interaction effect between duration of suffering and lie detector, F(1, 44) = 5.86, p = .020, ŋp 2 = .12.
Now I tried to calculate the minimal required sample size for a replication study with a power of .90.
I used the software Power*G to calculate the required sample size, but I am not sure if I am doing it right. Can somebody correct me please (see attachment)?
I am mostly struggling with which effect size I should use, is it .12 from the interaction effect above?
What is the amount of groups; because it is a Two Way ANOVA, is it 4 groups (2x2)?
Thanks a lot!
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