Need help in sample size determination

[yoha]

Hi all,

I'm planning to conduct an experiment using experimental animals and I'm having trouble computing the proper number. I want to use two groups, one control and the other one for treatment.
Any body have an idea about that?!

Thanks

[Mohamed Afifi]

Hi Yoha...
My suggestion would not be a precise one, statistically
Have a look on similar experiments and see their sample sizes... This may give you an initial thought and then you can at least know what to expect, or expected from you!

[Karabiner]

Or you use software, e.g. G*power http://www.psycho.uni-duesseldorf.de...n/aap/gpower3/

Kind regards

K.