Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Greg DePersio has 13+ years of professional experience in sales and SEO and 3+ years as a writer and editor. Simple random sampling is a method used to cull a smaller sample size from a larger ...

Concern over indoor pollution has been increasing since the 1980s (National Academy of Sciences, Assembly of Life Sciences, 1981). Detailed reviews by Samet et al. (1987), (1988) examined indoor ...

Two approaches to estimating a finite population mean from unequal probability samples are contrasted. In the prediction approach a model is specified for the population values and is used to predict ...

In many situations there is interest in parameters (e.g., mean) associated with the response distribution of individual clusters in a finite clustered population. We ...

Q. On “news” sites, one reads daily that “43% surveyed think this,” or “72% of …. name the group” are doing this. Yet, when one performs due diligence, the statistic recedes into non-importance, ...