This dialog is based on the standard assumptions for the a completely randomized onew-way layout. The sample SD of these means is given by Between-group SD . We assume that the samples are of equal size n per group . Alpha is the significance level of the anova F test, and Power is the probability of rejecting the null hypothesis of equal means. In practice, pilot data or past experience are used to obtain an estimate of Within-group SD .
Feedback is always welcome.
I will be working on more things like this when I can.