A Systematic sampling of the population at Baldwin High School could have been achieved by selecting every fifteenth student who walked into the cafeteria. To use systematic sampling, you must follow these steps: (1) order the members of the population in some way, and (2) decide how to sample (e.g., 1 out of every 15). For a 1-and-15 systematic sample, you would randomly choose one of the first 15 members of the population, and then every 15th member from then on.