A selection that is chosen randomly (purely by chance, with no predictability).
Every member of the population being studied should have an equal chance of being selected.
Example: you want to survey 100 people at a football match about their main job. Asking just people in one area might give poor results as there may be a group of workmates there! So instead you can make a list using randomly chosen seat numbers from the whole stadium, then go and find each seat and interview the person there.
Every member of the population being studied should have an equal chance of being selected.
Example: you want to survey 100 people at a football match about their main job. Asking just people in one area might give poor results as there may be a group of workmates there! So instead you can make a list using randomly chosen seat numbers from the whole stadium, then go and find each seat and interview the person there.
Copyright © 2018 MathsIsFun.com