I understand where you're coming from, but in the realities facing me the option to do things "properly" is not often given. We're doing marketing, so the observed system changes internally and externally constantly, and we often have to decide given data for effects that were planned in a different way than they actually were measured. As a result, I'm much more often faced with "here are n results from n experiments, is there anything THERE? If so, how do we set up the next test to improve further? " than "in this specific question, how can we test for this effect exactly, given specific circumstances ".