The other day I took a survey about cell phones and warranty programs. These are a couple of examples of the questions they asked. The whole questionnaire was filled with survey errors where they tried to lead people, or didn't give proper options when it came to choosing a response. In these two examples it doesn't allow for anything under six dollars (for example $0), or any higher than $15. Though really, if you're offering options like that, the person is probably going to pick the lowest you offer. But by not having it an open question they're almost forcing respondents to say "$6-$8" and depending on how they present that info then, they can say "the majority of our respondents would be willing to pay $6-$8 for a monthly warranty program" which is probably not the case, but because it is harder to say "other" (because it adds an extra step) most people will probably just click on the 6-8 option.
The second photo shows a question which asks you to say everything bad that has happened to your phone. However, there is NO option for "none of these happened" again, just an "other" option that again, takes longer to answer.
In my opinion, whoever created this survey should perhaps reevaluate their methods and recreate it, otherwise their results are bound to be skewed, and hopefully won't cause big problems down the road when phone companies, taking the information from this research, say that they're implementing a mandatory warranty program :P