oneway anova in Gpower

This screencast demonstrates how to work out sample size in G*Power for a ONEWAY ANOVA based on guestimates of treatment averages and standard deviation.

[@sadehavvad]

God bless! You helped me a lot!

[@ramangupta6687]

how do we define the size?

[@31415926535equalspi]

Thanks for the vid. Is the power analysis that Gpower uses for one-way ANOVA 1-tailed or 2-tailed?

[@ferrarotrainer5912]

Great video thank you.
But why you add 4 in the n size boxes?