How Stratified Random Sampling Works, With Examples

Stratified random sampling is a method of sampling that divides a population into smaller groups that form the basis of test ...
Arizona Daily Wildcat

First-ever sampling of asteroid’s surface

NASA’s OSIRIS-REx spacecraft will make its first attempt to collect a sample from asteroid Bennu on Oct. 20. Dante Lauretta, OSIRIS-REx principal investigator and a professor of planetary science and ...