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 ...

An example of a simple random sample would ... If the researcher knows more, it is better to use a different sampling technique, such as stratified random sampling, which helps to account for ...

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