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A medical book claims 40% of all children with eczema (chronic skin rashes) outgrow them. How...

A medical book claims 40% of all children with eczema (chronic skin rashes) outgrow them. How is a statistic like this determined?
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These kinds of statistics are determined by doing the survey. so you can find whether a child has skin rashes or not by a skin prick test, Iin whitch a small drop of an allergen will be placed on the skin. It's then pricked with a needle so that some of the allergens can get into the skin. If your child has an allergy to the substance, a swollen reddish bump will form, along with a ring around it.

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