Survey 20 friends: 'Cat, dog, fish, bird, hamster, none?'. Tally the answers. Plot as a pictograph — one icon per vote.
What to notice
Bigger samples give smoother results. With 20 people you'll see noise; with 200 the picture stabilises. This is sampling, in miniature.
Survey a different group (older relatives, classmates, sports team). Compare. Same question, different answers — context matters.