Understanding Populations and Samples
Think about trying to find out what every teenager in the UK thinks about social media - you'd never manage to ask all of them! That's where sampling comes in, which means studying a smaller group to understand the bigger picture.
The population is everyone you're interested in studying (like all UK teenagers), whilst a census would mean surveying every single person in that group. A sample is the smaller group you actually study to make conclusions about the whole population.
Sampling units are the individual people or items in your population, and the sampling frame is basically your contact list - everyone's name or number written down so you can pick who to study.
Quick tip: Censuses are super accurate but ridiculously expensive and time-consuming, which is why most research uses samples instead.
Quota sampling lets researchers handpick how many people from different groups they want (like choosing 50 boys and 50 girls), whilst opportunity sampling just uses whoever's available and willing to participate - think stopping people in the street for a quick survey.
