9.1.2 - Sampling techniques

9.1.2 Sampling techniques: random, stratified, volunteer and opportunity.

Use - sampling techniques to connect the rule to the data and decision in the question.

This matters because - sampling techniques determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply - sampling techniques to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: - Sampling techniques is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.