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: There are three types of variable.
*[[Independent Variable]]: The thing you choose to change in an [[investigation]].
*[[Control Variable]]s: The things you keep the same in an [[investigation]] to make it a [[Fair Test|fair test]].
*[[Dependent Variable]]: The thing you measure or observe in an [[investigation]].
: In an experiment or investigation there should only be 1 independent variable. If you change more than one thing at a time, it is not a [[Fair Test|fair test]].
===Examples===
An investigation to test the claim: All leaves are green.
{| class="wikitable"
|-
|'''Oak Leaf'''
|'''Beech Leaf'''
|[[File:MapleLeaf.png|center|200px]]
|[[File:ChestnutLeaf.png|center|200px]]
| style="height:20px; width:200px; text-align:left;" |*The leaves that were type of leaf chosen were was the '''independent variable'''.
*The colour of the leaves was the '''dependent variable'''
*The experiment was done at the same time of year for every tree because at different times leaves can change colour or fall off. This was a '''control variable'''
|}
{| class="wikitable"
|'''Results Table'''
|'''Variables'''
|-
|[[File:Results4.png|center|300px]]
| style="height:20px; width:200px; text-align:left;" |
*The type of food chosen was the '''independent variable'''.
*The colour of the iodine after being added to food was the '''dependent variable'''.
*There are many '''control variables''' that should be done. If the food colour was blue or black it might give the wrong result, so all the food should be the same pale colour. Another '''control variable''' is the amount of iodine used.
|}
{| class="wikitable"
|'''Experiment'''
|'''Variables'''
|-
| style="height:20px; width:200px; text-align:left;" |Cress seeds were put in pots with soil with half placed in a dark cupboard and half on a windowsill.
| style="height:20px; width:200px; text-align:left;" |
*'''Independent Variable''': Where you chose to put the cress seeds.
*'''Dependent Variable''': The observations of the cress seeds.
*'''Control Variable''': How long you left them for. They should all be left for the same amount of time or it's not a [[Fair Test|fair test]].
*'''Control Variable''': How much you watered them. They should both be watered the same amount to make it a [[Fair Test|fair test]].
|}
==Key Stage 3==
===Meaning===
A '''variable''' is anything which could affect the [[result]]s of an [[experiment]] or that you can change, keep the same, or [[measure]]/[[observe]] in an [[investigation]].
===About Variables===
: There are three groups of '''variable''' in an [[experiment]]:
:*[[Independent Variable]]: The thing you choose to change in an [[investigation]].
:*[[Control Variable]]s: The things you keep the same in an [[investigation]] to make it a [[Fair Test|fair test]].
:*[[Dependent Variable]]: The thing you measure or observe in an [[investigation]].
: In an experiment or investigation there should only be 1 [[Independent Variable|independent variable]]. If you change more than one thing at a time, it is not a [[Fair Test|fair test]].
==Key Stage 4==
===Meaning===
A '''variable''' is anything which could affect the [[result]]s of an [[experiment]] or that you can change, keep the same, or [[measure]]/[[observe]] in an [[investigation]].
===About Variables===
: There are three groups of '''variable''' in an [[experiment]]:
:*[[Independent Variable]]: The thing you choose to change in an [[investigation]].
:*[[Control Variable]]s: The things you keep the same in an [[investigation]] to make it a [[Fair Test|fair test]].
:*[[Dependent Variable]]: The thing you measure or observe in an [[investigation]].
: In an experiment or investigation there should only be 1 [[Independent Variable|independent variable]]. If you change more than one thing at a time, it is not a [[Fair Test|fair test]].
: There are three different types of '''variable''' which can be recorded in an [[experiment]]:
:*[[Categoric Variable]] - A variable that changes by category, not by numerical values (eg eye colour, blood type, type of animal.)
:*[[Discrete Variable]] - A variable which can only be specific values with no numbers in between (eg shoe size, number of people, number of [[atom]]s).
:*[[Continuous Variable]] - A variable which has any possible value (eg [[height]], [[time]], [[temperature]], [[Electrical Current|current]]).
===References===
====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 ''Variables page 9, GCSE Combined Science Trilogy; Physics, 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 ''Variables, page 10, GCSE Physics; The Complete 9-1 Course for AQA, 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 ''Variables, page 118, GCSE Biology, Hodder, AQA '']
:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f585 ''Variables, page 370-1, GCSE Biology; Student Book, Collins, 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 ''Variables, page 4, GCSE Biology; The Revision Guide, CGP, 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=ad276ad49df77ab4b40ab4fd0fe10394 ''Variables, page 4, 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=f0dfb66dafcb0c6e9449e7b1a4ae1ac478 ''Variables, page 4, GCSE Physics; The Revision Guide, 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 ''Variables, pages 10, 16, 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-21&linkId=51599bb45a2bfaf7c1b6a978b2ca2616 ''Variables, pages 10, 16, GCSE Combined Science Trilogy; Chemistry, CGP, 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 ''Variables, pages 103, 241-2, GCSE Combined Science Trilogy 1, 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 ''Variables, pages 144-5, 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 ''Variables, pages 17-18, 178, GCSE Physics, Hodder, 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 ''Variables, pages 253, GCSE Combined Science Trilogy 2, Hodder, 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 ''Variables, pages 264-265, 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 ''Variables, pages 277-279, GCSE Physics; Third Edition, Oxford University Press, 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=9e29fad914244909903e5e93f8a01d267 ''Variables, pages 5, 8, GCSE Chemistry; The Revision Guide, CGP, AQA '']
====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 ''Variables, page 10, GCSE Biology, 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 ''Variables, page 10, GCSE Physics, CGP, Edexcel '']
:[https://www.amazon.co.uk/gp/product/1292120215/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120215&linkCode=as2&tag=nrjc-21&linkId=8f96ddb76196848bafdb124354e4cf77 ''Variables, page 136, GCSE Chemistry, Pearson, 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 ''Variables, page 4, 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 ''Variables, page 5, 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 ''Variables, page 5, 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 ''Variables, page 5, GCSE Physics; The Revision Guide, CGP, 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 ''Variables, pages 9-1, 16, 17, 20, 21, GCSE Chemistry, 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 ''Variables, page 4, Gateway GCSE Combined Science; 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 ''Variables, page 5, Gateway GCSE Chemistry; 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 ''Variables, pages 5, 8, Gateway GCSE Biology; The Revision Guide, CGP, OCR '']
:[https://www.amazon.co.uk/gp/product/1782945687/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945687&linkCode=as2&tag=nrjc-21&linkId=9a598e52189317a20311d7a632747bc9 ''Variables, pages 5, 8, Gateway GCSE Physics; The Revision Guide, CGP, OCR '']
:[https://www.amazon.co.uk/gp/product/0198359810/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359810&linkCode=as2&tag=nrjc-21&linkId=d768d99f1a06f7c12fab40e5aef85a55 ''Variables, pages 8, 12-15, 281-282, 288-289, Gateway GCSE Biology, Oxford, OCR '']
:[https://www.amazon.co.uk/gp/product/0198359837/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359837&linkCode=as2&tag=nrjc-21&linkId=3c4229e8b023b2b60768e7ea2307cc6f ''Variables, pages 8, 12-15, 282-283, 287-288, Gateway GCSE Physics, Oxford, 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 ''Variables, pages 8, 14-15, 278, 296-297, 302-303, Gateway GCSE Chemistry, Oxford, OCR '']