Author note — to cover

Teach simple random sampling: number the population list, use random numbers or a draw, equal chance for every member. Questions describe a valid method step by step and explain why haphazard selection is not random. Exclude stratified sampling entirely, removed from 9-1 GCSE and now A level. Both tiers. (S1)

Introduction

—coming soon—

Practice and continue

Practice

Random sampling

Giving every member an equal chance, and why haphazard is not random.

Next lesson

Non-random sampling

Systematic and opportunity sampling, and the groups each one quietly misses.