Simple random sampling is the foundation for almost every method taught in introductory statistics classes. Many students, however, have difficulty understanding the difference between simple random ...

This is a preview. Log in through your library . Abstract We consider population-based case-control designs in which controls are selected by one of three cluster sampling plans from the entire ...

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, ...