Well if the survey is designed to answer the question, "what school is best for business", then yeah, leaving out business schools is a bad thing.
Well, perhaps I wasn't being as percise as I should have been. A large university could have many "schools"....and students from several of those schools, not just the Business school, end up working in "business". Depending on the business department, I think that would actually be the norm (I suspect most folks under the age of 30 who work in HR in my country dont have HR degrees). If businesses think highly of the general reputation of a school when hiring folks, I think thats relevant, right?
Some of this is likely a reflection of pure numbers. Arizona State is a school for idiots, but it's also one of the three largest in the US, so by statistical average, I'm sure there are thousands of decent graduates...