I have to agree with JamesRL
I've done some statistical sampling, although without the formal training he had working for the polling firm. How you write the questions and how you introduce the questions/survey to the target audience/sample universe significantly affects their responses.
Unfortunately, in our "fast-food, fast-everything" society, using related questions to eliminate question bias is frequently counter-productive to getting successful completion and return ratios. Unless the research is really significant, the best one can often do is attempt to write bias-neutral questions (not easy at all !!) and keep the survey form short and to-the-point. In such a situation, yes/no and true/false questions are completely useless. Better bets are multiple choice and "rank in order" (their preferences) types of questions, as long as the questions include an "other" selection choice and room for the respondent to explain.
I also agree with Toni that most "surveys" out there now, from "customer satisfaction" to product preference to political opinion polls are worthless to anyone, INCLUDING the perpetrator of the survey - they are so biased that the "results" are pre-formulated fiction designed by their creator to please their employer/contractor. The worst of the lot, IMHO, are the political junkmail (from ALL sides) that ask you to buy into their obviously slanted questions, then want you to pay them for the gathering of their irrelevant trivia!
Most current surveys and polls are useful for little more than fire-starter if hardcopy and not even that if electronic.
