The strata aren't proportional to their occurrence in the population in disproportionate sampling. Stratified random sampling differs from simple random sampling which involves the random ...

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 ...

The sampling method is the process used to pull samples from the population. Simple random samples and stratified random samples are both common methods for obtaining a sample. A simple random ...