3.3.3.1b - Scatter graphs and line of best fit

Interpret scatter graphs and line of best fit, including extrapolation of past data.

Use b - scatter graphs and line of best fit to connect the rule to the data and decision in the question.

This matters because b - scatter graphs and line of best fit determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply b - scatter graphs and line of best fit to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: b - Scatter graphs and line of best fit is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.