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==Key Stage 4==
===Meaning===
[[Results]] are [[precise]] if they given to a large number of the same [[reading]] or [[measurement]] [[Significant Figures|significant figuresrepeat]]edly gives a similar value.
===About Precision===
: [[Results]] may be said to be '''precise''' if each [[repeat]]ed [[result]]s is close to The smaller the same [[valuerange]].: The smaller the and [[uncertainty]] the greater the '''precision'''.: '''Precision''' is achieved by::*Using [[Measuring Instrument|instrument]]s with a high [[resolution]].:*[[Control Variable|Controllingcontrolling]] [[variable]]s so that [[reading]]s are stable over a long period of [[time]]. Sometimes : An [[reading]]s fluctuate so they cannot can be recorded to as many made more [[Significant Figures|significant figuresprecise]] as the by removing sources of [[Measuring InstrumentRandom Error|instrumentrandom error]] shows.
===Accuracy vs Precision===
{| class="wikitable"
|+ Experimental Measurements of [[pi]]
|-
| style="height:20px; width:100px; text-align:center;" |'''Method'''
| style="height:20px; width:100px; text-align:center;" |'''Test 1'''
| style="height:20px; width:100px; text-align:center;" |'''Test 2'''
| style="height:20px; width:100px; text-align:center;" |'''Test 3'''
| style="height:20px; width:100px; text-align:center;" |'''Average'''
| style="height:20px; width:100px; text-align:center;" |'''Range'''
|-
| style="height:20px; width:100px; text-align:center;" |Method 1
| style="height:20px; width:100px; text-align:center;" |3.27
| style="height:20px; width:100px; text-align:center;" |3.09
| style="height:20px; width:100px; text-align:center;" |3.01
| style="height:20px; width:100px; text-align:center;" |3.12
| style="height:20px; width:100px; text-align:center;" |0.26
|-
| style="height:20px; width:100px; text-align:center;" |Method 2
| style="height:20px; width:100px; text-align:center;" |3.91
| style="height:20px; width:100px; text-align:center;" |3.88
| style="height:20px; width:100px; text-align:center;" |3.88
| style="height:20px; width:100px; text-align:center;" |3.89
| style="height:20px; width:100px; text-align:center;" |0.03
|-
| style="height:20px; width:100px; text-align:center;" |Method 3
| style="height:20px; width:100px; text-align:center;" |3.57
| style="height:20px; width:100px; text-align:center;" |2.89
| style="height:20px; width:100px; text-align:center;" |2.93
| style="height:20px; width:100px; text-align:center;" |3.13
| style="height:20px; width:100px; text-align:center;" |0.68
|-
| style="height:20px; width:100px; text-align:left;" colspan = "6"|
: The number [[pi]] is 3.14159265359 correct to 12 [[Significant Figures|significant figures]].
Method 1: 3.1 is an The most [[accurate]] value for [[measurement]]s because they are the closest to [[pi]] but it is they are not very [[precise]] - Close to because they have a [[range]] of 0.26. Method 2: These are the least [[accurate]] [[measurement]]s because they are the real number, furthest from [[pi]] but not many they are very [[precise]] because they have a [[Significant Figures|significant figuresrange]]of only 0.03. Method 3: 3.2111 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 [[preciseMean Average|average]] value for is the most [[piaccurate]] but as it is the closes to [[pi]].|} {{#ev:youtube|https://www.youtube.com/watch?v=hRAFPdDppzs}} ===References=======AQA==== :[https://www.amazon.co.uk/gp/product/1782945563/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945563&linkCode=as2&tag=nrjc-21&linkId=9a1d023a374038e6072f33c4f3cf808b ''Precision (of results), page 5, GCSE Biology; The Revision Guide, CGP, AQA 'inaccurate']:[https://www.amazon.co.uk/gp/product/1782945962/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945962&linkCode=as2&tag=nrjc-21&linkId=476bb5c8d1dfb5c08ac81b6d4d1c98d8 '' Precision, page 12, GCSE Chemistry, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/178294639X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294639X&linkCode=as2&tag=nrjc- Not close enough 21&linkId=51599bb45a2bfaf7c1b6a978b2ca2616 ''Precision, page 12, GCSE Combined Science Trilogy; Chemistry, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/1471851338/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851338&linkCode=as2&tag=nrjc-21&linkId=425855d5890466e47189e1c21b67a1ea ''Precision, page 148, GCSE Biology, Hodder, AQA '']:[https://www.amazon.co.uk/gp/product/1471851346/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851346&linkCode=as2&tag=nrjc-21&linkId=3ac654f4b0da781c49c855a1af4c92ea ''Precision, page 274, GCSE Chemistry, Hodder, AQA '']:[https://www.amazon.co.uk/gp/product/1471851354/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851354&linkCode=as2&tag=nrjc-21&linkId=9012a0d354024419214fb3ad5ac44ba0 ''Precision, page 289, GCSE Combined Science Trilogy 1, Hodder, AQA '']:[https://www.amazon.co.uk/gp/product/1471851370/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851370&linkCode=as2&tag=nrjc-21&linkId=01c69b0ae058f809cf636033e6ba793e ''Precision, page 34, GCSE Physics, Hodder, AQA '']:[https://www.amazon.co.uk/gp/product/1782945598/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945598&linkCode=as2&tag=nrjc-21&linkId=ad276ad49df77ab4b40ab4fd0fe10192 ''Precision, page 5, GCSE Combined Science; The Revision Guide, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac375 ''Precision, page 5, GCSE Physics; The Revision Guide, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/1782945571/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945571&linkCode=as2&tag=nrjc-21&linkId=9e29fad914244909903e5e93f8a01d213 ''Precision, page 6, GCSE Chemistry; The Revision Guide, CGP, AQA '']:[https://www.amazon.co.uk/gp/product/1471851362/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1471851362&linkCode=as2&tag=nrjc-21&linkId=7d78d70a2044ee9982dae010c94af92a ''Precision, pages 10, 204, GCSE Combined Science Trilogy 2, Hodder, AQA '']:[https://www.amazon.co.uk/gp/product/0008158762/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158762&linkCode=as2&tag=nrjc-21&linkId=a0fffa35b3ea49a63404f6704e0df7cc ''Precision, pages 105, 286, GCSE Chemistry; Student Book, Collins, 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 ''] ====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 ''] ==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 real upper and lower bounds of a single numberbeing 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, but has several making a single [[reading]] more [[Significant Figures|significant figuresprecise]].