2.3.2.5c - Variance analysis

Apply variance analysis.

Use c - variance analysis to connect the rule to the data and decision in the question.

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

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

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