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They aren't surveying the general population or doing a census to get the 4% (or 5%) number - it's calculated by sample. I suspect it is very accurate as social scientists have spent decades arguing over it. -XC
Stats 101. As long as the sample size is statistically significant, a well constructed survey will report accurately compared to a complete census. No need to ask every single individual on a census.They aren't surveying the general population or doing a census to get the 4% (or 5%) number - it's calculated by sample.