Teacher copy: This page may include teaching prompts or answer keys. Answer keys in this public library can be viewed by anyone. Give learners a clean prompt, use checks as formative evidence, and change a case locally when prior access matters.
Success: independently analyse a new sampling claim and propose a fairer response. Prepare arts-club card. (AC9M8ST01, AC9M8ST02, AC9M8ST03, AC9M8ST04)
Set · 2 min. Clarify fictional status and that no learner interest is being asked.
Read · 4 min. Give the 100-person model population and three 20-person samples. Do not name the likely biased sample.
Plan · 5 min. Learners decide how to compare percentages, selection method and the claim's reach.
Independent work · 7 min. Compute shares, identify sampling concern and write a bounded population statement.
Check · 4 min. Multiply or divide to confirm each fraction; label percentages as model sample or known model population.
Exit · 3 min. “Why not use the music-club meeting to speak for all 100?” Key: people there are more likely to be interested. Use rubric/key.