S1.4.2 - Explanatory (independent)

Explanatory (independent) and Use to make predictions within the range of values of the response (dependent) variables. explanatory variable and the dangers of extrapolation.; Applications and interpretations.; Derivations will not be required.; Variables other than x and y may be used.; Linear change of variable may be required.

Use explanatory (independent) to connect the rule to the data and decision in the question.

This matters because explanatory (independent) determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply explanatory (independent) to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: Explanatory (independent) is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.