There are millions of people in New Zealand. How can a survey of 500 or 1,000 of them be accurate?

Variations on this question pop up quite a bit, so I’m going to explain how random samples of 500 or 1,000 can be useful. I’ll blog an explanation in a series three posts over the next week.

  1. What is sampling error? (click here)
  2. How do you interpret the margin of error? (click here)
  3. Is a sample of 500 or 1,000 really enough? (click here)
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