Quantitative research relies on analyzing statistical data, while qualitative research focuses on answering important business questions, including discovering why customers select products or ...

Consumers love free samples. And while retailers and manufacturers recognize sampling as an important marketing strategy, until now few understood sampling’s effectiveness. PromoWorks commissioned an ...

Note: This report was updated on Dec. 30, 2015 to reflect the January-July 2015 National Health Interview Survey estimates released on December 1, 2015. Telephone surveys face numerous challenges, but ...

Survey sampling and estimation methods form the cornerstone of modern statistical inference, underpinning research across the social, medical, and natural sciences. At their heart, these methods ...

Ali Hussain has a background that consists of a career in finance with large financial institutions and in journalism covering business. Vikki Velasquez is a researcher and writer who has managed, ...