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Topic - research sample methods. help!

Brendan H on 08 Dec 2009
need a bit of help here;

a study is conducted in to weather tap water or sterile water is better for irrigating wounds.

people chosen for the study are anyone who goes to a and e with a wound they are then randomly allocated to one of the 2 methods.

what kind of sampling is this? because the people are not randomly selected is it a cohort sample?
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