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 ...

Sampling is a statistical technique for efficiently ... are then chosen from each group. Stratified sampling is best used when a population is diverse. For example, if a company wanted to ...

Suppose that the sample of students described in the previous section was actually selected using stratified random sampling. In stratified sampling, the study population is divided into ...

He decides to use a stratified sampling technique to work out how many people of each age group he should select.