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: 1. To check for mistakes in our [[results]] called '[[Anomaly|anomalies]]'.
: 2. To calculate an [[Mean Average|average]] when we are taking [[Measure|measurements]].
===Examples===
{| class="wikitable"
|-
|'''Oak Leaf'''
|'''Beech Leaf'''
|'''Ash Leaf'''
|-
|[[File:OakLeaf.png|center|200px]]
|[[File:BeechLeaf.png|center|200px]]
|[[File:AshLeaf.png|center|200px]]
|-
|'''Maple Leaf'''
|'''Chestnut Leaf'''
|'''Variables'''
|-
|[[File:MapleLeaf.png|center|200px]]
|[[File:ChestnutLeaf.png|center|200px]]
| style="height:20px; width:200px; text-align:left;" |
The maple leaf is the only red leaf. What if the leaf you picked was the only one of its kind? You cannot tell if you only do the experiment once. You should get at least 3 leaves from each type of tree to check the red leaf is not an [[anomaly]].
|}