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→Key Stage 3
===About Variables===
: There are three types 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]]).