Systematic sampling is straightforward and low risk, offering better control. However, it may introduce sampling errors and data manipulation. Understand its benefits and weaknesses here.

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 ...

A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Academic survey researchers tend to differ ...