A themed activity to highlight the problem of survivor bias. It is based on the wartime problem of "the missing bullet holes" worked on by Abraham Wald. Pupils are given the problem without any previous discussion. At the end of the task a discussion is made of how it is the aircraft that did not return that should inform the positioning of the armour, i.e high priority areas should be where the bullet holes are not. Perfect for getting discussion going on the pitfalls of data analysis.
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