Open main menu
Key Stage Wiki β

Difference between revisions of "Accurate"

(→‎About Accuracy)
 
(7 intermediate revisions by one other user not shown)
Line 6: Line 6:
 
: [[Accuracy]] is achieved by:
 
: [[Accuracy]] is achieved by:
 
:*Removing [[Systematic Error|systematic errors]] from the [[reading]]s.
 
:*Removing [[Systematic Error|systematic errors]] from the [[reading]]s.
−
:*Removing [[Zero Error|zero errors]] by [[Calibration|calibrating]] [[Scientific Instrument|instruments]] before the [[investigation]].
+
:*Removing [[Zero Error|zero errors]] by [[Calibration|calibrating]] [[Measuring Instrument|instruments]] before the [[investigation]].
 
:*[[Control Variable|Controlling]] all the [[variable]]s except for the [[Independent Variable|independent variable]] and the [[Dependent Variable]].
 
:*[[Control Variable|Controlling]] all the [[variable]]s except for the [[Independent Variable|independent variable]] and the [[Dependent Variable]].
−
: If there are [[Random Error|random errors]] and a small [[Sample Size|sample size]] taking [[repeat]] [[readings]], removing [[anomaly|anomalies]] and calculating an [[Mean Average|average]] can improve the '''accuracy'''.
+
: If there are [[Random Error|random errors]] and a small [[Sample Size|sample size]] taking [[repeat]] [[reading]]s, removing [[anomaly|anomalies]] and calculating an [[Mean Average|average]] can improve the '''accuracy'''.
 
: If there are [[Systematic Error|systematic error]]s or [[Zero Error|zero errors]] the [[results]] can be improved by finding the source of the [[error]] and correcting it.
 
: If there are [[Systematic Error|systematic error]]s or [[Zero Error|zero errors]] the [[results]] can be improved by finding the source of the [[error]] and correcting it.
  
 
===Accuracy vs Precision===
 
===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]].
 
: The number [[pi]] is 3.14159265359 correct to 12 [[Significant Figures|significant figures]].
  
−
: 3.1 is an [[accurate]] value for [[pi]] but it is not very [[precise]] - Close to the real number, but not many [[Significant Figures|significant figures]].
+
Method 1: The most [[accurate]] [[measurement]]s because they are the closest to [[pi]] but they are not very [[precise]] because they have a [[range]] of 0.26.
−
: 3.2111 is a [[precise]] value for [[pi]] but it is '''inaccurate''' - Not close enough to the real number, but has several [[Significant Figures|significant figures]].
+
 
 +
Method 2: These are the least [[accurate]] [[measurement]]s 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 [[Mean Average|average]] is the most [[accurate]] 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 ''Accuracy (of results), page 5, GCSE Biology; The Revision Guide, CGP, 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 ''Accuracy of results, page 274, GCSE Chemistry, 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 ''Accuracy, page 13, GCSE Physics, Hodder, 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 ''Accuracy, page 148, GCSE Biology, 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=ad276ad49df77ab4b40ab4fd0fe09654 ''Accuracy, 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=f0dfb66dafcb0c6e9449e7b1a4ae1ac7 ''Accuracy, 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=9e29fad914244909903e5e93f8a01d28 ''Accuracy, 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 ''Accuracy, 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 ''Accuracy, pages 104, 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 ''Accuracy, 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 ''Accuracy, pages 279-280, GCSE Physics; Third Edition, Oxford University Press, AQA'']
 +
:[https://www.amazon.co.uk/gp/product/1782946403/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946403&linkCode=as2&tag=nrjc-21&linkId=32a0abb60dff015b15b50e9b1d7b4644 ''Accurate results, page 11, GCSE Combined Science Trilogy; Physics, CGP, AQA'']
 +
:[https://www.amazon.co.uk/gp/product/1782945954/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945954&linkCode=as2&tag=nrjc-21&linkId=100574c08fbbb64318256eb79ed61a76 ''Accurate results, page 12, GCSE Biology, CGP, AQA'']
 +
:[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 ''Accurate results, page 12, GCSE Chemistry, CGP, AQA'']
 +
:[https://www.amazon.co.uk/gp/product/1782946381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782946381&linkCode=as2&tag=nrjc-21&linkId=5ec5fc3f6429e30c1d9ab9bca2bccf93 ''Accurate results, page 12, GCSE Combined Science Trilogy; Biology, 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-21&linkId=51599bb45a2bfaf7c1b6a978b2ca2616 ''Accurate results, page 12, GCSE Combined Science Trilogy; Chemistry, CGP, AQA '']
 +
:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Accurate results, page 12, GCSE Physics; The Complete 9-1 Course for AQA, CGP, 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 ''Accuracy, 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 ''Accuracy, 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 ''Accuracy, 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 ''Accuracy, 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 ''Accuracy, page 6, GCSE Physics; The Revision Guide, CGP, Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1782948163/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948163&linkCode=as2&tag=nrjc-21&linkId=0fdbfd5dd397d6e24a9dfb250f08587f ''Accuracy, pages 12, 15, GCSE Physics, CGP, Edexcel '']
 +
:[https://www.amazon.co.uk/gp/product/1782948120/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782948120&linkCode=as2&tag=nrjc-21&linkId=dedef775c6a43dbb0a609441525adac0 ''Accurate results, page 12, GCSE Biology, 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 ''Accuracy, 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 ''Accuracy, 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 ''Accuracy, page 6, GCSE Chemistry; The Revision Guide, CGP, OCR Gateway '']
 +
:[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 ''Accuracy, pages 10, 11, 152, 166, Gateway GCSE Chemistry, Oxford, OCR '']

Latest revision as of 10:08, 30 November 2019

Contents

Key Stage 4

Meaning

Results are accurate if they are close to the true value.

About Accuracy

Accuracy is achieved by:
If there are random errors and a small sample size taking repeat readings, removing anomalies and calculating an average can improve the accuracy.
If there are systematic errors or zero errors the results can be improved by finding the source of the error and correcting it.

Accuracy vs Precision

Experimental Measurements of pi
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
The number pi is 3.14159265359 correct to 12 significant figures.

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

Accuracy (of results), page 5, GCSE Biology; The Revision Guide, CGP, AQA
Accuracy of results, page 274, GCSE Chemistry, Hodder, AQA
Accuracy, page 13, GCSE Physics, Hodder, AQA
Accuracy, page 148, GCSE Biology, Hodder, AQA
Accuracy, page 5, GCSE Combined Science; The Revision Guide, CGP, AQA
Accuracy, page 5, GCSE Physics; The Revision Guide, CGP, AQA
Accuracy, page 6, GCSE Chemistry; The Revision Guide, CGP, AQA
Accuracy, pages 10, 204, GCSE Combined Science Trilogy 2, Hodder, AQA
Accuracy, pages 104, 286, GCSE Chemistry; Student Book, Collins, AQA
Accuracy, pages 266-267, GCSE Chemistry; Third Edition, Oxford University Press, AQA
Accuracy, pages 279-280, GCSE Physics; Third Edition, Oxford University Press, AQA
Accurate results, page 11, GCSE Combined Science Trilogy; Physics, CGP, AQA
Accurate results, page 12, GCSE Biology, CGP, AQA
Accurate results, page 12, GCSE Chemistry, CGP, AQA
Accurate results, page 12, GCSE Combined Science Trilogy; Biology, CGP, AQA
Accurate results, page 12, GCSE Combined Science Trilogy; Chemistry, CGP, AQA
Accurate results, page 12, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA

Edexcel

Accuracy, page 12, GCSE Chemistry, CGP, Edexcel
Accuracy, page 5, GCSE Combined Science; The Revision Guide, CGP, Edexcel
Accuracy, page 6, GCSE Biology; The Revision Guide, CGP, Edexcel
Accuracy, page 6, GCSE Chemistry; The Revision Guide, CGP, Edexcel
Accuracy, page 6, GCSE Physics; The Revision Guide, CGP, Edexcel
Accuracy, pages 12, 15, GCSE Physics, CGP, Edexcel
Accurate results, page 12, GCSE Biology, CGP, Edexcel

OCR

Accuracy, page 5, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR
Accuracy, page 6, Gateway GCSE Biology; The Revision Guide, CGP, OCR
Accuracy, page 6, GCSE Chemistry; The Revision Guide, CGP, OCR Gateway
Accuracy, pages 10, 11, 152, 166, Gateway GCSE Chemistry, Oxford, OCR
Retrieved from "https://keystagewiki.com/index.php?title=Accurate&oldid=20774"