Geography · GCSE · Fieldwork & Skills

Collecting data: primary, secondary and sampling

Collecting data: primary, secondary and samplingFree3:38Heddy Score 3 of 7, below the standard

What you need to know

  • A sample is a smaller group drawn from a population so you can learn about the whole group without measuring everyone.
  • In a random sample, every member has an equal chance of being chosen.
  • A stratified sample takes people from each subgroup so those groups are represented.
  • A systematic sample selects at a regular interval.
  • The sample can still differ from the population, and that difference is sampling error.
Heddy Score3/7, Below the standard
See the seven stars
  • Trusted source · passed. The creator's own upload, live and playable here.
  • On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
  • Spec-true · not judged yet. Accurate, and right for the current UK specification.
  • Focused · passed. One idea, short enough to watch in one go.
  • Accessible · passed. Good captions, clear sound and pictures.
  • Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
  • Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
★ passed · ☆ pending · ✕ failed
Our students

Not enough students yet

Our own students' answers. These are what move ★7 Proven.
On YouTube

583K views · 7.53K likes · Whats Up Dude 243K subscribers

As reported by YouTube on 2026-11-02. Not part of the Heddy Score.
How the Heddy Score works

Why we picked it

It defines the random, stratified and systematic samples that geography fieldwork uses.

Whats Up Dude on YouTubechecked 2026-10-18

Plays from youtube-nocookie.com. No YouTube cookies until you press play.