OCR GCSE Biology B · J257
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
- Revise: Apparatus and Techniques
- Revise: Controlling Factors
The extent to which an investigation tests the intended relationship, so that changes in the dependent variable can be attributed to the independent variable rather than another factor.
- Revise: Planning Experiments
An investigation is valid when its design allows it to answer the intended question; in a simple comparative experiment, other important variables are controlled so that changes in the dependent variable can be attributed to the independent variable.