The normal margin of error on a political opinion poll would be 1.96 sigma—a 95% confidence interval (that’s how you’d get a margin of error of just over 3 percentage points on a poll of 1000 people.
The normal margin of error on a political opinion poll would be 1.96 sigma—a 95% confidence interval (that’s how you’d get a margin of error of just over 3 percentage points on a poll of 1000 people.