[Closed] Stats whizzes....I need your help!

So I have some data from a couple of different experimental conditions.

I'm interested in both differences in the mean and variance in each condition.

So I can do some anovas to compare means, and levene's test to compare variance.

However, is there any way of assessing the [i]power[/i] of a test for homogeneity of variance (eg levene's)?
The reason I ask is that in general variance looks similar across my conditions, but how do I know if I've got enough data to be sure the variance doesn't change?