In survey, most report or data collected are often biased due to some factors. The best explanation for why this result is probably biased is that Opponents of the new tax are more likely to respond than anyone else, so 70%, percent is likely an overestimate.
Leading questions are example of bias in survey. They are often very noticeable form of bias in research.
Conclusively, the Three types of bias can be refered to as information bias, selection bias, and confounding.
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