the bigger survey ought to get some kind of extra credit. So the formula I use is (sample/600) ^ 0.5 e.g. the poll’s sample size, divided by 600, and taken to its square root. The number 600 is ...

The nuts and bolts of our public opinion surveys. A summary of ... using the standard formula (at the 95% confidence level) of (SQRT(.25/sample size))*1.96, plus adjustment for design effects.

In presidential elections, even the smallest changes in horse-race poll results seem to become imbued with deep meaning. But they are often overstated. Pollsters ...