Why Donald Trump May Be Weaker Than a Recent Poll Suggests
No matter the subject, for surveys to make sense, they have to be sampling the correct population. If you want to learn about car buyers, a researcher needs to interview people who buy cars. If you want to learn about diaper buyers, you need to interview people who buy diapers. If you want to learn about beer drinkers, you need to interview beer drinkers. And if you want to learn about likely Republican caucus-goers in Iowa or primary voters in New Hampshire, you should interview likely caucus-goers in Iowa and likely primary voters in New Hampshire.
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