A behind-the-scenes blog about research methods at Pew Research Center. For our latest findings, visit pewresearch.org. Every survey finding published by Pew Research ...

Oct. 8, 2008— -- Surveys based on a random sample of respondents are subject to sampling error – a calculation of how closely the results reflect the attitudes ...

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 ...

As Americans await the presidential election results, many are looking to the polls for clues. A poll’s margin of error describes how close a survey result can ...

The first video in our “Methods 101” series is about random sampling, a concept that undergirds all probability-based survey research. Here’s how it works. Fresh data delivered Saturday mornings Thank ...

This is a preview. Log in through your library . Abstract Data were collected when transmitters and receivers were at known locations. One method used to determine the direction of the transmitters, ...

Honorary Academic in Psychology, University of Auckland, Waipapa Taumata Rau Nicole Satherley works for iNZight Analytics which designs and undertakes research, but not market or polling research.

This article explores the impact of test volume, microbial distribution, and dilution errors on bioburden testing variability. It presents statistical approaches to ...