Author note — to cover

Contrast a census of the whole population with taking a sample; questions justify the choice via cost, time, practicality and destructive testing, giving one advantage and one disadvantage of each. Discursive only, no calculations. How to choose the sample belongs to the random and non-random sampling pages. Both tiers. (S1)

• Fluency — direct questions on census or sample, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).