Mixed 2-way ANOVA

Hi,

I am looking to carry out an experiment, i want to compare a control
group made up of all particpants (to obtain a baseline) to 3 other
groups (made up of all the particpants split into 3 groups -
participants will be put into these groups depending on set criteria -
the groups will probably be unequal). Each of the 4 groups will carry
out 2 different tests and three measures will be collected.

So I will have a 4X2 mixed design. Can anybody help me out with sample
sizes, i.e. how many participants will i need for each of the 4
conditions in order for it to be statistically significant. I have read
pages on power anylsis, but i t seems i need to carry out a pilot
study, for which i don't have time. Any ideas?

.

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