P3.5-Graph interpretation and uncertainties

Relate straight-line graphs to y = mx + c, determine gradients and intercepts, read coordinates from trend lines, estimate absolute and percentage uncertainties, and use half-range for repeated readings where appropriate.

Use graph interpretation and uncertainties to connect the rule to the data and decision in the question.

This matters because graph interpretation and uncertainties determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply graph interpretation and uncertainties to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: Graph interpretation and uncertainties is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.