In a school investigation, which variable is the one the learner deliberately changes between readings?

1. An investigation compares one cause with one effect, so the two must be kept apart by name. 2. The variable the learner sets and changes between readings is the independent variable. 3. The variable that responds to that change, and is then measured, is the dependent variable. 4. A controlled variable is deliberately held constant so that it cannot affect the comparison. 5. Calling it the measured variable describes what is read off, not what was chosen and changed. _Source: Siyavula Physical Sciences Grade 12 (Everything Science, CC BY 4.0), Chapter 1: Skills for science_