Jill is interested in testing the efficacy of a treatment versus a placebo. Thus she wants to use a 2 Arm Design.
So far, we know that Jill is going to use a 2 arm design testing the effect of a treatment versus a control on reducing the size of a tumor. Next we need to know if Jill plans on taking independent samples or if she is interested in a paired samples design. Are you taking independent or paired samples?
-- ErinEsp - 31 Jan 2010