Difference between revisions of "Precise"
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===References=== | ===References=== | ||
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:[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Precision, pages 266-267, GCSE Chemistry; Third Edition, Oxford University Press, AQA ''] | :[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Precision, pages 266-267, GCSE Chemistry; Third Edition, Oxford University Press, AQA ''] | ||
:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Precision, pages 279-280, GCSE Physics; Third Edition, Oxford University Press, AQA ''] | :[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Precision, pages 279-280, GCSE Physics; Third Edition, Oxford University Press, AQA ''] | ||
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| + | ====Edexcel==== | ||
| + | |||
| + | :[https://www.amazon.co.uk/gp/product/1782948147/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948147&linkCode=as2&tag=nrjc-21&linkId=f63dcd8345f4e49c717b39a228a36c7c ''Precision, page 12, GCSE Chemistry, CGP, Edexcel ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1782945741/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945741&linkCode=as2&tag=nrjc-21&linkId=30da4f2178da182547b62a7329d13b57 ''Precision, page 5, GCSE Combined Science; The Revision Guide, CGP, Edexcel ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1782946748/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946748&linkCode=as2&tag=nrjc-21&linkId=a4f0348fc37d0ba1bb52d27f8679581f ''Precision, page 6, GCSE Biology; The Revision Guide, CGP, Edexcel ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1782945725/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945725&linkCode=as2&tag=nrjc-21&linkId=694be7494de75af3349537d34e13f7f0 ''Precision, page 6, GCSE Chemistry; The Revision Guide, CGP, Edexcel ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/1782945733/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945733&linkCode=as2&tag=nrjc-21&linkId=2a2dbec9db6bf5766c0458d908fa0a52 ''Precision, page 6, GCSE Physics; The Revision Guide, CGP, Edexcel ''] | ||
| + | |||
| + | ====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 ''Precision, page 5, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR ''] | ||
| + | :[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 ''Precision, page 6, 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 ''Precision, page 6, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR ''] | ||
| + | :[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Precision, pages 10, 11, 167, Gateway GCSE Chemistry, Oxford, OCR ''] | ||
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| + | ==Key Stage 5== | ||
| + | ===Meaning=== | ||
| + | [[Results]] are [[precise]] if the same [[reading]] or [[measurement]] [[repeat]]edly gives a similar value. | ||
| + | |||
| + | ===About Precision=== | ||
| + | : A single [[reading]] may be more [[precise]] if the [[resolution]] of the [[Measuring Instrument|measuring instrument]] is higher. This is due to the upper and lower bounds of a single number being smaller when the number has a greater [[resolution]]. A [[ruler]] that [[measure]]s to the nearest 1cm has an [[uncertainty]] of ±5mm for each [[reading]]. A [[ruler]] that [[measure]]s to the nearest 1mm has an [[uncertainty]] of ±0.5mm, making a single [[reading]] more [[precise]]. | ||
Latest revision as of 16:09, 18 December 2019
Contents
Key Stage 4
Meaning
Results are precise if the same reading or measurement repeatedly gives a similar value.
About Precision
- The smaller the range and uncertainty the greater the precision.
- Precision is achieved by controlling variables so that readings are stable over a long period of time.
- An readings can be made more precise by removing sources of random error.
Accuracy vs Precision
| Method | Test 1 | Test 2 | Test 3 | Average | Range |
| Method 1 | 3.27 | 3.09 | 3.01 | 3.12 | 0.26 |
| Method 2 | 3.91 | 3.88 | 3.88 | 3.89 | 0.03 |
| Method 3 | 3.57 | 2.89 | 2.93 | 3.13 | 0.68 |
Method 1: The most accurate measurements because they are the closest to pi but they are not very precise because they have a range of 0.26. Method 2: These are the least accurate measurements because they are the furthest from pi but they are very precise because they have a range of only 0.03. Method 3: Each measurement is not accurate because they are far from pi, they are also the least precise because they have a range of 0.68. However, the average is the most accurate as it is the closes to pi. | |||||
References
AQA
- Precision (of results), page 5, GCSE Biology; The Revision Guide, CGP, AQA
- Precision, page 12, GCSE Chemistry, CGP, AQA
- Precision, page 12, GCSE Combined Science Trilogy; Chemistry, CGP, AQA
- Precision, page 148, GCSE Biology, Hodder, AQA
- Precision, page 274, GCSE Chemistry, Hodder, AQA
- Precision, page 289, GCSE Combined Science Trilogy 1, Hodder, AQA
- Precision, page 34, GCSE Physics, Hodder, AQA
- Precision, page 5, GCSE Combined Science; The Revision Guide, CGP, AQA
- Precision, page 5, GCSE Physics; The Revision Guide, CGP, AQA
- Precision, page 6, GCSE Chemistry; The Revision Guide, CGP, AQA
- Precision, pages 10, 204, GCSE Combined Science Trilogy 2, Hodder, AQA
- Precision, pages 105, 286, GCSE Chemistry; Student Book, Collins, AQA
- Precision, pages 266-267, GCSE Chemistry; Third Edition, Oxford University Press, AQA
- Precision, pages 279-280, GCSE Physics; Third Edition, Oxford University Press, AQA
Edexcel
- Precision, page 12, GCSE Chemistry, CGP, Edexcel
- Precision, page 5, GCSE Combined Science; The Revision Guide, CGP, Edexcel
- Precision, page 6, GCSE Biology; The Revision Guide, CGP, Edexcel
- Precision, page 6, GCSE Chemistry; The Revision Guide, CGP, Edexcel
- Precision, page 6, GCSE Physics; The Revision Guide, CGP, Edexcel
OCR
- Precision, page 5, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR
- Precision, page 6, Gateway GCSE Biology; The Revision Guide, CGP, OCR
- Precision, page 6, Gateway GCSE Chemistry; The Revision Guide, CGP, OCR
- Precision, pages 10, 11, 167, Gateway GCSE Chemistry, Oxford, OCR
Key Stage 5
Meaning
Results are precise if the same reading or measurement repeatedly gives a similar value.
About Precision
- A single reading may be more precise if the resolution of the measuring instrument is higher. This is due to the upper and lower bounds of a single number being smaller when the number has a greater resolution. A ruler that measures to the nearest 1cm has an uncertainty of ±5mm for each reading. A ruler that measures to the nearest 1mm has an uncertainty of ±0.5mm, making a single reading more precise.