OCR GCSE Combined Science A · J250
Specification WS1.1g, WS1.2b, WS1.2e · Biology Paper 1, Biology Paper 2, Chemistry Paper 1, Chemistry Paper 2, Physics Paper 1, Physics Paper 2
The extent to which an investigation tests what it is intended to test, rather than being affected by other factors.
Revise: Evidence-Based Decision MakingValidity concerns whether the investigation really tests what it intends to test. If people drinking green tea also sleep longer, better memory scores might be due to sleep rather than the drink. Keeping relevant conditions the same, or accounting for differences, makes the comparison more valid.
- Revise: Experimental Planning and Procedure Design
The extent to which a method answers the intended question without other factors affecting the outcome.