S1.4.1 - Scatter diagrams

Scatter diagrams.; Linear regression.; Calculation of the equation of a linear regression line using the method of least squares.; Students may be required to draw this regression line on a scatter diagram.

Use scatter diagrams to connect the rule to the data and decision in the question.

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

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

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