Learn about standard error, its role as the standard deviation of a sample, and how it measures the accuracy of a sample ...

It’s in vogue these days to declare the building blocks of statistical inference irrelevant to assessing the performance of schools. For example, Joel Klein recently argued that statistical ...

Sampling error refers to the difference between our survey estimate and what we would have found had we been able to interview everyone in the population. When it is reported, it is described as “plus ...

For a couple of weeks now, I’ve been working from a new version of my pollster ratings, which account in a more sophisticated way for the relationship between the quality of the pollster, and that ...

A simple random sample is a subset of a statistical population where each member of the population is equally likely to be ...

Drawn both by lower data collection costs and substantial advantages in how questionnaires can be designed and administered, survey research is rapidly moving to the Web. Adoption of the Web for data ...