Valid
Contents
Key Stage 4
Meaning
Validity is whether a method produces results which test the hypothesis.
About Validity
- A valid experiment is one which tests the hypothesis posed.
- An invalid experiment would be one which does not test the hypothesis.
- An experiment may be made invalid by not using control variables as they may affect the results instead of the independent variable.
- A conclusion may also be valid or invalid depending on whether the conclusion fits the results that were given.
Examples
Valid Experiment
- Hypothesis - The extension of a spring is directly proportional to the force applied to the spring.
- Valid Method - Attach different known weights to the spring and measure the extension of the spring.
Invalid Experiment
- Hypothesis - The extension of a spring is directly proportional to the force applied to the spring.
- Invalid Method 1 - Attach different known weights to an elastic band and measure the extension of the elastic band.
- Invalid Method 2 - Attach different known weights to the spring and measure the width of the spring.
- Invalid Method 4 - Attach different known weights each to a different spring and measure the extension of each spring.
References
AQA
- Valid results, page 4, GCSE Biology; The Revision Guide, CGP, AQA
- Valid results, page 9, GCSE Biology, CGP, AQA
- Valid results, page 9, GCSE Combined Science Trilogy; Biology, CGP, AQA
- Valid, page 180, GCSE Biology; Student Book, Collins, AQA
- Validity of investigations, page 127, GCSE Physics, Hodder, AQA
- Validity of results, page 274, GCSE Chemistry, Hodder, AQA
- Validity of results, pages 204, GCSE Combined Science Trilogy 2, Hodder, AQA
- Validity, page 4, GCSE Combined Science; The Revision Guide, CGP, AQA
- Validity, page 4, GCSE Physics; The Revision Guide, CGP, AQA
- Validity, page 5, GCSE Chemistry; The Revision Guide, CGP, AQA
- Validity, page 8, GCSE Combined Science Trilogy; Physics, CGP, AQA
- Validity, page 9, GCSE Chemistry, CGP, AQA
- Validity, page 9, GCSE Combined Science Trilogy; Chemistry, CGP, AQA
- Validity, page 9, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
Edexcel
- Validity, page 4, GCSE Combined Science; The Revision Guide, CGP, Edexcel
- Validity, page 5, GCSE Biology; The Revision Guide, CGP, Edexcel
- Validity, page 5, GCSE Chemistry; The Revision Guide, CGP, Edexcel
- Validity, page 9, GCSE Chemistry, CGP, Edexcel
- Validity, page 9, GCSE Physics, CGP, Edexcel