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==Key Stage 3==
===Meaning===
A [[correlation]] is when two [[variable]]s change together.
===About Correlations===
: [[Correlation]]s may be positive, where one [[variable]] increases, the other [[variable]] increases.
: [[Correlation]]s may be negative, where one [[variable]] increases, the other [[variable]] decreases.
: A [[correlation]] does not mean that one [[variable]] causes another. The number of of children diagnoses with autism has increased as the amount of organic food sold has increased. This does not mean that organic food causes autism or that autistic people prefer organic food. It is just a coincidence.
===Examples===
{| class="wikitable"
|-
|[[File:PositiveCorrelation.png|center|500px]]
|-
| style="height:20px; width:500px; text-align:center;" |This [[Scatter Graph|scatter graph]] shows a positive [[correlation]].
|-
|[[File:NegativeCorrelation.png|center|500px]]
|-
| style="height:20px; width:500px; text-align:center;" |This [[Scatter Graph|scatter graph]] shows a negative [[correlation]].
|-
|[[File:NoCorrelation.png|center|500px]]
|-
| style="height:20px; width:500px; text-align:center;" |This [[Scatter Graph|scatter graph]] shows no [[correlation]].
|}
==Key Stage 4==
===Meaning===
A [[correlation]] is when two [[variable]]s change together.