3.3.3.5b - Contribution calculation

Calculate and interpret contribution.

Use b - contribution calculation to connect the rule to the data and decision in the question.

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

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

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