Difference between revisions of "Sample Size"
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| + | :[https://www.amazon.co.uk/gp/product/1782945660/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945660&linkCode=as2&tag=nrjc-21&linkId=83aa4500ad7759e7f401a1c5ba5df758 ''Sample size, page 5, Gateway GCSE Biology; The Revision Guide, CGP, OCR ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1782945679/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945679&linkCode=as2&tag=nrjc-21&linkId=a2db42f7b4bdf10cafaafa3bb9120940 ''Sample sizes, page 5, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Sample sizes, page 5, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR ''] | ||
Latest revision as of 18:32, 18 December 2019
Contents
Key Stage 4
Meaning
Sample size is the number of readings or measurements taken in an investigation.
About Sample Size
- The results of an investigation may be unreliable if a small sample size is used.
- A small sample size increases the effect of anomalous results on the conclusion of the investigation.
- A large sample size allows averages to be taken to reduce the effect of random errors.
- A large sample size makes it easier to spot anomalous results.
Examples
Reliable Investigation
- Hypothesis - The taller a person, the larger their foot size.
- Method - Measure the height and foot size of a number of people.
- Sample Size - 5 people.
This is an unreliable investigation because there are not enough people to be certain of any conclusion. They may all have very large feet and be short.
- Hypothesis - The taller a person, the larger their foot size.
- Method - Measure the height and foot size of a number of people.
- Sample Size - 5,000,000 people.
This is a reliable investigation because there are enough people to average out any anomalous results. For every short person with large feet there is likely to be a tall person with small feet.
References
AQA
- Sample size, page 10, GCSE Chemistry, CGP, AQA
- Sample size, page 10, GCSE Combined Science Trilogy; Chemistry, CGP, AQA
- Sample size, page 11, GCSE Biology, CGP, AQA
- Sample size, page 11, GCSE Combined Science Trilogy; Biology, CGP, AQA
- Sample size, page 4, GCSE Biology; The Revision Guide, CGP, AQA
- Sample size, page 5, GCSE Combined Science; The Revision Guide, CGP, AQA
- Sample sizes, page 10, GCSE Combined Science Trilogy; Physics, CGP, AQA
- Sample sizes, page 11, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA
- Sample sizes, pages 262-263, GCSE Biology; Third Edition, Oxford University Press, AQA
Edexcel
- Sample size, page 11, GCSE Biology, CGP, Edexcel
- Sample size, page 4, GCSE Combined Science; The Revision Guide, CGP, Edexcel
- Sample size, page 5, GCSE Biology; The Revision Guide, CGP, Edexcel
- Sample sizes, page 11, GCSE Physics, CGP, Edexcel
- Sample sizes, page 5, GCSE Chemistry; The Revision Guide, CGP, Edexcel
- Sample sizes, pages 10, 11, GCSE Chemistry, CGP, Edexcel