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 ...

HOLLIDAYSBURG — High levels of lead recently found in samples of drinking water in some homes and buildings in Hollidaysburg Borough were the result of a sampling error, according to Rick Pope, ...

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 ...