general population
Refers to the population at large, often in contrast to a specific subgroup. Used in statistical, medical, or sociological contexts.
This survey was conducted targeting the general population.
一般大衆 also means 'general public' but often carries a nuance of the masses or common people, while 一般集団 is more neutral and technical.
Compound of 一般 (general) and 集団 (group, population).