In psychological research, ensuring that findings are generalizable to the broader population is critical. Researchers often use various sampling methods to select participants. One commonly discussed method is random sampling, which aims to give every individual in the population an equal chance of being chosen to participate. However, researchers must also consider other sampling techniques, particularly when studying specific groups with unique characteristics.
Which of the following methods specifically emphasizes selecting participants in such a way that allows for equal representation of subgroups within a population?