Abstract
Many public opinion polls report a mythical margin of error. These reported margins of error are calculated on the basis of a nonexistent (fictitious) dichotomous poll question and are completely unrelated to the actual question responses in a poll. Because it can convey a false sense of poll precision, a mythical margin of error can lead to unsupported and even incorrect inferences regarding the precision of a public opinion poll. This research note documents the existence and implications of mythical margins of error and offers suggestions for addressing them.
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