Consider the example in the section "Stratified Sampling". The study population is a junior high school with a total of 4,000 students in grades 7, 8, and 9. Researchers want to know how much these ...

Proper quality measures are vital in all areas of clinical laboratory testing to prevent or avoid carryover between samples, as well as to minimize the risk of false-positive results. The sample ...

How many hazmat response teams have a clear and concise system for environmental sampling at every emergency? Most hazmat responders know the importance of environmental sampling at emergencies; not ...