rnorm(16, 110, 10)
A statistical population refers to the entire group of things that you're trying to measure, study, or analyze. It can refer to anything from humans to scores to gumballs. The key thing is that a population refers to all of them. A census is a study or survey involving the entire population, so in the case of Mighty Gumball, they’re conducting a census of their gumball population by tasting every single one of them. A census can provide you with accurate information about your population, but it’s not always practical. When populations are large or infinite, it's just not possible to include every member.
Define your target population
Define your sampling units
Define your Sampling Frame (표집틀)
If you don’t design your sample well, your sample may not be accurate.
See sampling document
Poorly designed questions
see Sampling