Stand somewhere safe near a road. For 10 minutes, tally cars by colour. You've just done your first survey.
What you'll discover
- White, black, silver and grey dominate everywhere
- Bright reds and blues are rarer than you'd expect
- Different times of day give different mixes (commute vs school run)
Plot your tally as a bar chart. Compare with a friend who counted at a different street — same world, different samples.