Unfortunately, it's extremely difficult to write a survey that everyone will interpret in the same way. With a poorly written survey, everyone interprets the question differently and they all give an answer based on that question. What you end up with is a whole series of answers to in effect, lots of different questions, as if they'd all filled out different surveys. This obviously leads to skewed results, when those answers are reconciled with the original meaning the question writer had in mind.
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