So the formula I use is (sample/600) ^ 0.5. ... These large sample size polls now have a comparatively larger weight, and as such Obama’s numbers have dropped a couple points in Texas, ...

If the bias is large, the sample size would be small. If the bias is very small, the sample size will be large, as can be seen from the equation. This seems to be the opposite of what industry wants ...

Course TopicsPower analyses and sample size calculations are important parts of many research projects. Often, before data are even collected, it is necessary to calculate and justify the required ...

You can use the Wilson score interval formula below to solve for n—one day I’ll explain why that’s my preferred approach—or you can use an algorithm to solve for the sample size given by a ...