Discover how attribute sampling enhances audit accuracy by evaluating internal controls and analyzing population traits, ...

Consider a population of 70 individuals, for which you wish to estimate the mean annual income, μ. Assume that you have decided to use the following estimation procedure to make your estimate: simple ...

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 ...

Stratified sampling is considered, where (a) the mean integrated squared error (MISE) metric is used in place of the mean squared error (MSE) metric; (b) the entire ...

Discover how simple random sampling ensures accurate and unbiased population research, offering efficiency and fairness over ...

Pew Research Center’s international surveys are largely conducted via telephone or face-to-face interviews, depending on the country. (The exceptions are the United States and Australia, where surveys ...

How four pollsters, and The Upshot, interpreted 867 poll responses: You’ve heard of the “margin of error” in polling. Just about every article on a new poll ...